diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index de79438..8de76ba 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -42,6 +42,9 @@ jobs:
           - "3.10"
         os:
           - ubuntu-latest
+        extension:
+          - "skip_cython"
+          - "use_cython"
     runs-on: ${{ matrix.os }}
     steps:
       - uses: actions/checkout@v3
@@ -55,7 +58,12 @@ jobs:
           python-version: ${{ matrix.python-version }}
           cache: "poetry"
       - name: Install Dependencies
-        run: poetry install
+        run: |
+          if [ "${{ matrix.extension }}" = "skip_cython" ]; then
+            SKIP_CYTHON=1 poetry install
+          else
+            poetry install
+          fi
       - name: Test with Pytest
         run: export $(dbus-launch); poetry run pytest --cov-report=xml
       - name: Upload coverage to Codecov
diff --git a/README.md b/README.md
index 42a1d71..1f82790 100644
--- a/README.md
+++ b/README.md
@@ -48,7 +48,8 @@ Desktop users can use this library to create their own scripts and utilities to
 
 dbus-fast plans to improve over other DBus libraries for Python in the following ways:
 
-- Zero dependencies and pure Python 3.
+- Zero dependencies and pure Python 3
+- An optional cython extension is available to speed up (un)marshalling
 - Focus on performance
 - Support for multiple IO backends including asyncio and the GLib main loop.
 - Nonblocking IO suitable for GUI development.
diff --git a/bench/unmarshall.py b/bench/unmarshall.py
index aaaf429..71bfc0f 100644
--- a/bench/unmarshall.py
+++ b/bench/unmarshall.py
@@ -3,6 +3,9 @@ import timeit
 
 from dbus_fast._private.unmarshaller import Unmarshaller
 
+#  cythonize -X language_level=3 -a -i  src/dbus_fast/_private/unmarshaller.py
+
+
 bluez_rssi_message = (
     "6c04010134000000e25389019500000001016f00250000002f6f72672f626c75657a2f686369302f6465"
     "765f30385f33415f46325f31455f32425f3631000000020173001f0000006f72672e667265656465736b"
diff --git a/build.py b/build.py
new file mode 100644
index 0000000..4eca054
--- /dev/null
+++ b/build.py
@@ -0,0 +1,32 @@
+"""Build optional cython modules."""
+
+import contextlib
+import os
+from distutils.command.build_ext import build_ext
+
+
+class BuildExt(build_ext):
+    def build_extensions(self):
+        try:
+            super().build_extensions()
+        except Exception:
+            pass
+
+
+def build(setup_kwargs):
+    if os.environ.get("SKIP_CYTHON", False):
+        return
+    with contextlib.suppress(Exception):
+        from Cython.Build import cythonize
+
+        setup_kwargs.update(
+            dict(
+                ext_modules=cythonize(
+                    [
+                        "src/dbus_fast/_private/marshaller.py",
+                        "src/dbus_fast/_private/unmarshaller.py",
+                    ]
+                ),
+                cmdclass=dict(build_ext=BuildExt),
+            )
+        )
diff --git a/poetry.lock b/poetry.lock
index 036fb9d..adf2eee 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -32,7 +32,7 @@ tests = ["cloudpickle", "coverage[toml] (>=5.0.2)", "hypothesis", "mypy (>=0.900
 tests_no_zope = ["cloudpickle", "coverage[toml] (>=5.0.2)", "hypothesis", "mypy (>=0.900,!=0.940)", "pympler", "pytest (>=4.3.0)", "pytest-mypy-plugins"]
 
 [[package]]
-name = "babel"
+name = "Babel"
 version = "2.10.3"
 description = "Internationalization utilities"
 category = "main"
@@ -44,7 +44,7 @@ pytz = ">=2015.7"
 
 [[package]]
 name = "certifi"
-version = "2022.6.15.1"
+version = "2022.9.24"
 description = "Python package for providing Mozilla's CA Bundle."
 category = "main"
 optional = false
@@ -71,7 +71,7 @@ python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
 
 [[package]]
 name = "coverage"
-version = "6.4.4"
+version = "6.5.0"
 description = "Code coverage measurement for Python"
 category = "dev"
 optional = false
@@ -83,6 +83,14 @@ tomli = {version = "*", optional = true, markers = "python_full_version <= \"3.1
 [package.extras]
 toml = ["tomli"]
 
+[[package]]
+name = "Cython"
+version = "0.29.32"
+description = "The Cython compiler for writing C extensions for the Python language."
+category = "dev"
+optional = false
+python-versions = ">=2.6, !=3.0.*, !=3.1.*, !=3.2.*"
+
 [[package]]
 name = "docutils"
 version = "0.17.1"
@@ -93,7 +101,7 @@ python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
 
 [[package]]
 name = "idna"
-version = "3.3"
+version = "3.4"
 description = "Internationalized Domain Names in Applications (IDNA)"
 category = "main"
 optional = false
@@ -109,7 +117,7 @@ python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 
 [[package]]
 name = "importlib-metadata"
-version = "4.12.0"
+version = "4.13.0"
 description = "Read metadata from Python packages"
 category = "main"
 optional = false
@@ -120,9 +128,9 @@ typing-extensions = {version = ">=3.6.4", markers = "python_version < \"3.8\""}
 zipp = ">=0.5"
 
 [package.extras]
-docs = ["jaraco.packaging (>=9)", "rst.linker (>=1.9)", "sphinx"]
+docs = ["furo", "jaraco.packaging (>=9)", "jaraco.tidelift (>=1.4)", "rst.linker (>=1.9)", "sphinx (>=3.5)"]
 perf = ["ipython"]
-testing = ["flufl.flake8", "importlib-resources (>=1.3)", "packaging", "pyfakefs", "pytest (>=6)", "pytest-black (>=0.3.7)", "pytest-checkdocs (>=2.4)", "pytest-cov", "pytest-enabler (>=1.3)", "pytest-flake8", "pytest-mypy (>=0.9.1)", "pytest-perf (>=0.9.2)"]
+testing = ["flake8 (<5)", "flufl.flake8", "importlib-resources (>=1.3)", "packaging", "pyfakefs", "pytest (>=6)", "pytest-black (>=0.3.7)", "pytest-checkdocs (>=2.4)", "pytest-cov", "pytest-enabler (>=1.3)", "pytest-flake8", "pytest-mypy (>=0.9.1)", "pytest-perf (>=0.9.2)"]
 
 [[package]]
 name = "iniconfig"
@@ -133,7 +141,7 @@ optional = false
 python-versions = "*"
 
 [[package]]
-name = "jinja2"
+name = "Jinja2"
 version = "3.1.2"
 description = "A very fast and expressive template engine."
 category = "main"
@@ -169,7 +177,7 @@ rtd = ["attrs", "myst-parser", "pyyaml", "sphinx", "sphinx-copybutton", "sphinx-
 testing = ["coverage", "pytest", "pytest-cov", "pytest-regressions"]
 
 [[package]]
-name = "markupsafe"
+name = "MarkupSafe"
 version = "2.1.1"
 description = "Safely add untrusted strings to HTML/XML markup."
 category = "main"
@@ -178,19 +186,19 @@ python-versions = ">=3.7"
 
 [[package]]
 name = "mdit-py-plugins"
-version = "0.3.0"
+version = "0.3.1"
 description = "Collection of plugins for markdown-it-py"
 category = "main"
 optional = false
-python-versions = "~=3.6"
+python-versions = ">=3.7"
 
 [package.dependencies]
 markdown-it-py = ">=1.0.0,<3.0.0"
 
 [package.extras]
-code_style = ["pre-commit (==2.6)"]
-rtd = ["myst-parser (>=0.14.0,<0.15.0)", "sphinx-book-theme (>=0.1.0,<0.2.0)"]
-testing = ["coverage", "pytest (>=3.6,<4)", "pytest-cov", "pytest-regressions"]
+code_style = ["pre-commit"]
+rtd = ["attrs", "myst-parser (>=0.16.1,<0.17.0)", "sphinx-book-theme (>=0.1.0,<0.2.0)"]
+testing = ["coverage", "pytest", "pytest-cov", "pytest-regressions"]
 
 [[package]]
 name = "mdurl"
@@ -202,17 +210,17 @@ python-versions = ">=3.7"
 
 [[package]]
 name = "myst-parser"
-version = "0.18.0"
+version = "0.18.1"
 description = "An extended commonmark compliant parser, with bridges to docutils & sphinx."
 category = "main"
 optional = false
 python-versions = ">=3.7"
 
 [package.dependencies]
-docutils = ">=0.15,<0.19"
+docutils = ">=0.15,<0.20"
 jinja2 = "*"
 markdown-it-py = ">=1.0.0,<3.0.0"
-mdit-py-plugins = ">=0.3.0,<0.4.0"
+mdit-py-plugins = ">=0.3.1,<0.4.0"
 pyyaml = "*"
 sphinx = ">=4,<6"
 typing-extensions = "*"
@@ -221,7 +229,7 @@ typing-extensions = "*"
 code_style = ["pre-commit (>=2.12,<3.0)"]
 linkify = ["linkify-it-py (>=1.0,<2.0)"]
 rtd = ["ipython", "sphinx-book-theme", "sphinx-design", "sphinxcontrib.mermaid (>=0.7.1,<0.8.0)", "sphinxext-opengraph (>=0.6.3,<0.7.0)", "sphinxext-rediraffe (>=0.2.7,<0.3.0)"]
-testing = ["beautifulsoup4", "coverage[toml]", "pytest (>=6,<7)", "pytest-cov", "pytest-param-files (>=0.3.4,<0.4.0)", "pytest-regressions", "sphinx-pytest"]
+testing = ["beautifulsoup4", "coverage[toml]", "pytest (>=6,<7)", "pytest-cov", "pytest-param-files (>=0.3.4,<0.4.0)", "pytest-regressions", "sphinx (<5.2)", "sphinx-pytest"]
 
 [[package]]
 name = "packaging"
@@ -266,7 +274,7 @@ optional = false
 python-versions = ">=3.7"
 
 [[package]]
-name = "pygments"
+name = "Pygments"
 version = "2.13.0"
 description = "Pygments is a syntax highlighting package written in Python."
 category = "main"
@@ -358,7 +366,7 @@ optional = false
 python-versions = "*"
 
 [[package]]
-name = "pyyaml"
+name = "PyYAML"
 version = "6.0"
 description = "YAML parser and emitter for Python"
 category = "main"
@@ -383,6 +391,19 @@ urllib3 = ">=1.21.1,<1.27"
 socks = ["PySocks (>=1.5.6,!=1.5.7)"]
 use_chardet_on_py3 = ["chardet (>=3.0.2,<6)"]
 
+[[package]]
+name = "setuptools"
+version = "65.4.1"
+description = "Easily download, build, install, upgrade, and uninstall Python packages"
+category = "dev"
+optional = false
+python-versions = ">=3.7"
+
+[package.extras]
+docs = ["furo", "jaraco.packaging (>=9)", "jaraco.tidelift (>=1.4)", "pygments-github-lexers (==0.0.5)", "rst.linker (>=1.9)", "sphinx (>=3.5)", "sphinx-favicon", "sphinx-hoverxref (<2)", "sphinx-inline-tabs", "sphinx-notfound-page (==0.8.3)", "sphinx-reredirects", "sphinxcontrib-towncrier"]
+testing = ["build[virtualenv]", "filelock (>=3.4.0)", "flake8 (<5)", "flake8-2020", "ini2toml[lite] (>=0.9)", "jaraco.envs (>=2.2)", "jaraco.path (>=3.2.0)", "mock", "pip (>=19.1)", "pip-run (>=8.8)", "pytest (>=6)", "pytest-black (>=0.3.7)", "pytest-checkdocs (>=2.4)", "pytest-cov", "pytest-enabler (>=1.3)", "pytest-flake8", "pytest-mypy (>=0.9.1)", "pytest-perf", "pytest-xdist", "tomli-w (>=1.0.0)", "virtualenv (>=13.0.0)", "wheel"]
+testing-integration = ["build[virtualenv]", "filelock (>=3.4.0)", "jaraco.envs (>=2.2)", "jaraco.path (>=3.2.0)", "pytest", "pytest-enabler", "pytest-xdist", "tomli", "virtualenv (>=13.0.0)", "wheel"]
+
 [[package]]
 name = "snowballstemmer"
 version = "2.2.0"
@@ -392,8 +413,8 @@ optional = false
 python-versions = "*"
 
 [[package]]
-name = "sphinx"
-version = "5.1.1"
+name = "Sphinx"
+version = "5.2.3"
 description = "Python documentation generator"
 category = "main"
 optional = false
@@ -401,28 +422,27 @@ python-versions = ">=3.6"
 
 [package.dependencies]
 alabaster = ">=0.7,<0.8"
-babel = ">=1.3"
-colorama = {version = ">=0.3.5", markers = "sys_platform == \"win32\""}
+babel = ">=2.9"
+colorama = {version = ">=0.4.5", markers = "sys_platform == \"win32\""}
 docutils = ">=0.14,<0.20"
-imagesize = "*"
-importlib-metadata = {version = ">=4.4", markers = "python_version < \"3.10\""}
-Jinja2 = ">=2.3"
-packaging = "*"
-Pygments = ">=2.0"
+imagesize = ">=1.3"
+importlib-metadata = {version = ">=4.8", markers = "python_version < \"3.10\""}
+Jinja2 = ">=3.0"
+packaging = ">=21.0"
+Pygments = ">=2.12"
 requests = ">=2.5.0"
-snowballstemmer = ">=1.1"
+snowballstemmer = ">=2.0"
 sphinxcontrib-applehelp = "*"
 sphinxcontrib-devhelp = "*"
 sphinxcontrib-htmlhelp = ">=2.0.0"
 sphinxcontrib-jsmath = "*"
 sphinxcontrib-qthelp = "*"
 sphinxcontrib-serializinghtml = ">=1.1.5"
-sphinxcontrib-websupport = {version = "*", optional = true, markers = "extra == \"docs\""}
 
 [package.extras]
 docs = ["sphinxcontrib-websupport"]
-lint = ["docutils-stubs", "flake8 (>=3.5.0)", "flake8-bugbear", "flake8-comprehensions", "isort", "mypy (>=0.971)", "sphinx-lint", "types-requests", "types-typed-ast"]
-test = ["cython", "html5lib", "pytest (>=4.6)", "typed-ast"]
+lint = ["docutils-stubs", "flake8 (>=3.5.0)", "flake8-bugbear", "flake8-comprehensions", "flake8-simplify", "isort", "mypy (>=0.981)", "sphinx-lint", "types-requests", "types-typed-ast"]
+test = ["cython", "html5lib", "pytest (>=4.6)", "typed_ast"]
 
 [[package]]
 name = "sphinx-rtd-theme"
@@ -529,21 +549,6 @@ python-versions = ">=3.5"
 lint = ["docutils-stubs", "flake8", "mypy"]
 test = ["pytest"]
 
-[[package]]
-name = "sphinxcontrib-websupport"
-version = "1.2.4"
-description = "Sphinx API for Web Apps"
-category = "main"
-optional = false
-python-versions = ">=3.5"
-
-[package.dependencies]
-sphinxcontrib-serializinghtml = "*"
-
-[package.extras]
-lint = ["flake8"]
-test = ["Sphinx", "pytest", "sqlalchemy", "whoosh"]
-
 [[package]]
 name = "tomli"
 version = "2.0.1"
@@ -591,7 +596,7 @@ docs = ["myst-parser", "Sphinx", "sphinx-rtd-theme", "sphinxcontrib-asyncio", "s
 [metadata]
 lock-version = "1.1"
 python-versions = "^3.7"
-content-hash = "9fd2eabd8a7994fff6fe3158104f040dee41b33c9ab2ce7e563f40f20b0d643b"
+content-hash = "96d521d1e66777febd43aad81ec451dbf5a15873e1434052283b6ecdf3095c07"
 
 [metadata.files]
 alabaster = [
@@ -606,13 +611,13 @@ attrs = [
     {file = "attrs-22.1.0-py2.py3-none-any.whl", hash = "sha256:86efa402f67bf2df34f51a335487cf46b1ec130d02b8d39fd248abfd30da551c"},
     {file = "attrs-22.1.0.tar.gz", hash = "sha256:29adc2665447e5191d0e7c568fde78b21f9672d344281d0c6e1ab085429b22b6"},
 ]
-babel = [
+Babel = [
     {file = "Babel-2.10.3-py3-none-any.whl", hash = "sha256:ff56f4892c1c4bf0d814575ea23471c230d544203c7748e8c68f0089478d48eb"},
     {file = "Babel-2.10.3.tar.gz", hash = "sha256:7614553711ee97490f732126dc077f8d0ae084ebc6a96e23db1482afabdb2c51"},
 ]
 certifi = [
-    {file = "certifi-2022.6.15.1-py3-none-any.whl", hash = "sha256:43dadad18a7f168740e66944e4fa82c6611848ff9056ad910f8f7a3e46ab89e0"},
-    {file = "certifi-2022.6.15.1.tar.gz", hash = "sha256:cffdcd380919da6137f76633531a5817e3a9f268575c128249fb637e4f9e73fb"},
+    {file = "certifi-2022.9.24-py3-none-any.whl", hash = "sha256:90c1a32f1d68f940488354e36370f6cca89f0f106db09518524c88d6ed83f382"},
+    {file = "certifi-2022.9.24.tar.gz", hash = "sha256:0d9c601124e5a6ba9712dbc60d9c53c21e34f5f641fe83002317394311bdce14"},
 ]
 charset-normalizer = [
     {file = "charset-normalizer-2.1.1.tar.gz", hash = "sha256:5a3d016c7c547f69d6f81fb0db9449ce888b418b5b9952cc5e6e66843e9dd845"},
@@ -623,78 +628,120 @@ colorama = [
     {file = "colorama-0.4.5.tar.gz", hash = "sha256:e6c6b4334fc50988a639d9b98aa429a0b57da6e17b9a44f0451f930b6967b7a4"},
 ]
 coverage = [
-    {file = "coverage-6.4.4-cp310-cp310-macosx_10_9_x86_64.whl", hash = "sha256:e7b4da9bafad21ea45a714d3ea6f3e1679099e420c8741c74905b92ee9bfa7cc"},
-    {file = "coverage-6.4.4-cp310-cp310-macosx_11_0_arm64.whl", hash = "sha256:fde17bc42e0716c94bf19d92e4c9f5a00c5feb401f5bc01101fdf2a8b7cacf60"},
-    {file = "coverage-6.4.4-cp310-cp310-manylinux_2_17_aarch64.manylinux2014_aarch64.whl", hash = "sha256:cdbb0d89923c80dbd435b9cf8bba0ff55585a3cdb28cbec65f376c041472c60d"},
-    {file = "coverage-6.4.4-cp310-cp310-manylinux_2_5_i686.manylinux1_i686.manylinux_2_17_i686.manylinux2014_i686.whl", hash = "sha256:67f9346aeebea54e845d29b487eb38ec95f2ecf3558a3cffb26ee3f0dcc3e760"},
-    {file = "coverage-6.4.4-cp310-cp310-manylinux_2_5_x86_64.manylinux1_x86_64.manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:42c499c14efd858b98c4e03595bf914089b98400d30789511577aa44607a1b74"},
-    {file = "coverage-6.4.4-cp310-cp310-musllinux_1_1_aarch64.whl", hash = "sha256:c35cca192ba700979d20ac43024a82b9b32a60da2f983bec6c0f5b84aead635c"},
-    {file = "coverage-6.4.4-cp310-cp310-musllinux_1_1_i686.whl", hash = "sha256:9cc4f107009bca5a81caef2fca843dbec4215c05e917a59dec0c8db5cff1d2aa"},
-    {file = "coverage-6.4.4-cp310-cp310-musllinux_1_1_x86_64.whl", hash = "sha256:5f444627b3664b80d078c05fe6a850dd711beeb90d26731f11d492dcbadb6973"},
-    {file = "coverage-6.4.4-cp310-cp310-win32.whl", hash = "sha256:66e6df3ac4659a435677d8cd40e8eb1ac7219345d27c41145991ee9bf4b806a0"},
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@@ -702,7 +749,7 @@ markdown-it-py = [
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@@ -745,16 +792,16 @@ markupsafe = [
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@@ -779,7 +826,7 @@ pycairo = [
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 ]
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 ]
@@ -806,7 +853,7 @@ pytz = [
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 ]
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@@ -845,13 +892,17 @@ requests = [
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 ]
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+    {file = "setuptools-65.4.1.tar.gz", hash = "sha256:3050e338e5871e70c72983072fe34f6032ae1cdeeeb67338199c2f74e083a80e"},
+]
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+Sphinx = [
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+    {file = "sphinx-5.2.3-py3-none-any.whl", hash = "sha256:7abf6fabd7b58d0727b7317d5e2650ef68765bbe0ccb63c8795fa8683477eaa2"},
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@@ -888,10 +939,6 @@ sphinxcontrib-serializinghtml = [
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 ]
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diff --git a/pyproject.toml b/pyproject.toml
index 3036ed7..e4fdda7 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -14,6 +14,7 @@ classifiers = [
     "Operating System :: OS Independent",
     "Topic :: Software Development :: Libraries",
 ]
+build = "build.py"
 packages = [
     { include = "dbus_fast", from = "src" },
 ]
@@ -24,23 +25,24 @@ packages = [
 
 [tool.poetry.dependencies]
 python = "^3.7"
-
-# Documentation Dependencies
-sphinxcontrib-asyncio = {version = "^0.3.0", extras = ["docs"]}
-sphinxcontrib-fulltoc = {version = "^1.2.0", extras = ["docs"]}
-Sphinx = {version = "^5.1.1", extras = ["docs"]}
-myst-parser = {version = "^0.18.0", extras = ["docs"]}
-sphinx-rtd-theme = {version = "^1.0.0", extras = ["docs"]}
 async-timeout = ">=3.0.0"
 
+# Documentation Dependencies
+sphinxcontrib-asyncio = {version = "^0.3.0", optional = true}
+sphinxcontrib-fulltoc = {version = "^1.2.0", optional = true}
+Sphinx = {version = "^5.1.1", optional = true}
+myst-parser = {version = "^0.18.0", optional = true}
+sphinx-rtd-theme = {version = "^1.0.0", optional = true}
+
 [tool.poetry.extras]
-docs = [
-    "myst-parser",
-    "sphinx",
-    "sphinx-rtd-theme",
-    "sphinxcontrib-asyncio",
-    "sphinxcontrib-fulltoc"
-]
+docs = ["myst-parser", "sphinx", "sphinx-rtd-theme", "sphinxcontrib-asyncio", "sphinxcontrib-fulltoc"]
+
+[tool.poetry.group.docs.dependencies]
+myst-parser = "^0.18.0"
+sphinx = "^5.1.1"
+sphinx-rtd-theme = "^1.0.0"
+sphinxcontrib-asyncio = "^0.3.0"
+sphinxcontrib-fulltoc = "^1.2.0"
 
 [tool.poetry.dev-dependencies]
 pytest = "^7.0"
@@ -50,6 +52,8 @@ pytest-asyncio = "^0.19.0"
 [tool.poetry.group.dev.dependencies]
 pycairo = "^1.21.0"
 PyGObject = "^3.42.2"
+Cython = "^0.29.32"
+setuptools = "^65.4.1"
 
 [tool.semantic_release]
 branch = "main"
@@ -100,5 +104,5 @@ module = "docs.*"
 ignore_errors = true
 
 [build-system]
-requires = ["poetry-core>=1.0.0"]
+requires = ['setuptools>=65.4.1', 'wheel', 'Cython', "poetry-core>=1.0.0"]
 build-backend = "poetry.core.masonry.api"
diff --git a/setup.py b/setup.py
deleted file mode 100644
index 0324376..0000000
--- a/setup.py
+++ /dev/null
@@ -1,9 +0,0 @@
-#!/usr/bin/env python
-
-# This is a shim to allow GitHub to detect the package, build is done with poetry
-# Taken from https://github.com/Textualize/rich
-
-import setuptools
-
-if __name__ == "__main__":
-    setuptools.setup(name="dbus-fast")
diff --git a/src/dbus_fast/_private/marshaller.pxd b/src/dbus_fast/_private/marshaller.pxd
new file mode 100644
index 0000000..b69d4ea
--- /dev/null
+++ b/src/dbus_fast/_private/marshaller.pxd
@@ -0,0 +1,34 @@
+"""cdefs for marshaller.py"""
+
+import cython
+
+
+cdef class Marshaller:
+
+    cdef object signature_tree
+    cdef object _buf
+    cdef object body
+
+
+    @cython.locals(
+        offset=cython.ulong,
+    )
+    cpdef int align(self, unsigned long n)
+
+
+    @cython.locals(
+        signature_len=cython.uint,
+        written=cython.uint,
+    )
+    cpdef write_string(self, object value, _ = *)
+
+    @cython.locals(
+        array_len=cython.uint,
+        written=cython.uint,
+    )
+    cpdef write_array(self, object array, object type)
+
+    @cython.locals(
+        written=cython.uint,
+    )
+    cpdef write_single(self, object type_, object body)
diff --git a/src/dbus_fast/_private/marshaller.py b/src/dbus_fast/_private/marshaller.py
index 43db7b2..30ffd1e 100644
--- a/src/dbus_fast/_private/marshaller.py
+++ b/src/dbus_fast/_private/marshaller.py
@@ -1,4 +1,4 @@
-from struct import Struct, error, pack
+from struct import Struct, error
 from typing import Any, Callable, Dict, Iterable, List, Optional, Tuple
 
 from ..signature import SignatureTree, SignatureType, Variant
@@ -7,39 +7,48 @@ PACK_UINT32 = Struct("<I").pack
 
 
 class Marshaller:
-    def __init__(self, signature: str, body: Any) -> None:
+    """Marshall data for Dbus."""
+
+    __slots__ = ("signature_tree", "_buf", "body")
+
+    def __init__(self, signature: str, body: List[Any]) -> None:
+        """Marshaller constructor."""
         self.signature_tree = SignatureTree._get(signature)
-        self.buffer = bytearray()
+        self._buf = bytearray()
         self.body = body
 
+    @property
+    def buffer(self):
+        return self._buf
+
     def align(self, n) -> int:
-        offset = n - len(self.buffer) % n
+        offset = n - len(self._buf) % n
         if offset == 0 or offset == n:
             return 0
-        self.buffer.extend(bytes(offset))
+        self._buf.extend(bytes(offset))
         return offset
 
     def write_boolean(self, boolean: bool, _=None) -> int:
         written = self.align(4)
-        self.buffer.extend(PACK_UINT32(int(boolean)))
+        self._buf.extend(PACK_UINT32(int(boolean)))
         return written + 4
 
     def write_signature(self, signature: str, _=None) -> int:
-        signature = signature.encode()
+        signature_bytes = signature.encode()
         signature_len = len(signature)
-        self.buffer.append(signature_len)
-        self.buffer.extend(signature)
-        self.buffer.append(0)
+        self._buf.append(signature_len)
+        self._buf.extend(signature_bytes)
+        self._buf.append(0)
         return signature_len + 2
 
-    def write_string(self, value: str, _=None) -> int:
-        value = value.encode()
+    def write_string(self, value, _=None) -> int:
+        value_bytes = value.encode()
         value_len = len(value)
         written = self.align(4) + 4
-        self.buffer.extend(PACK_UINT32(value_len))
-        self.buffer.extend(value)
+        self._buf.extend(PACK_UINT32(value_len))
+        self._buf.extend(value_bytes)
         written += value_len
-        self.buffer.append(0)
+        self._buf.append(0)
         written += 1
         return written
 
@@ -52,9 +61,9 @@ class Marshaller:
         # TODO max array size is 64MiB (67108864 bytes)
         written = self.align(4)
         # length placeholder
-        offset = len(self.buffer)
+        offset = len(self._buf)
         written += self.align(4) + 4
-        self.buffer.extend(PACK_UINT32(0))
+        self._buf.extend(PACK_UINT32(0))
         child_type = type_.children[0]
 
         if child_type.token in "xtd{(":
@@ -67,13 +76,13 @@ class Marshaller:
                 array_len += self.write_dict_entry([key, value], child_type)
         elif child_type.token == "y":
             array_len = len(array)
-            self.buffer.extend(array)
+            self._buf.extend(array)
         elif child_type.token in self._writers:
             writer, packer, size = self._writers[child_type.token]
             if not writer:
                 for value in array:
                     array_len += self.align(size) + size
-                    self.buffer.extend(packer(value))
+                    self._buf.extend(packer(value))
             else:
                 for value in array:
                     array_len += writer(self, value, child_type)
@@ -84,7 +93,7 @@ class Marshaller:
 
         array_len_packed = PACK_UINT32(array_len)
         for i in range(offset, offset + 4):
-            self.buffer[i] = array_len_packed[i - offset]
+            self._buf[i] = array_len_packed[i - offset]
 
         return written + array_len
 
@@ -109,7 +118,7 @@ class Marshaller:
         writer, packer, size = self._writers[t]
         if not writer:
             written = self.align(size)
-            self.buffer.extend(packer(body))
+            self._buf.extend(packer(body))
             return written + size
         return writer(self, body, type_)
 
@@ -119,10 +128,10 @@ class Marshaller:
             self._construct_buffer()
         except error:
             self.signature_tree.verify(self.body)
-        return self.buffer
+        return self._buf
 
     def _construct_buffer(self):
-        self.buffer.clear()
+        self._buf.clear()
         for i, type_ in enumerate(self.signature_tree.types):
             t = type_.token
             if t not in self._writers:
@@ -132,11 +141,11 @@ class Marshaller:
             if not writer:
 
                 # In-line align
-                offset = size - len(self.buffer) % size
+                offset = size - len(self._buf) % size
                 if offset != 0 and offset != size:
-                    self.buffer.extend(bytes(offset))
+                    self._buf.extend(bytes(offset))
 
-                self.buffer.extend(packer(self.body[i]))
+                self._buf.extend(packer(self.body[i]))
             else:
                 writer(self, self.body[i], type_)
 
diff --git a/src/dbus_fast/_private/unmarshaller.pxd b/src/dbus_fast/_private/unmarshaller.pxd
new file mode 100644
index 0000000..88d6c5d
--- /dev/null
+++ b/src/dbus_fast/_private/unmarshaller.pxd
@@ -0,0 +1,62 @@
+"""cdefs for unmarshaller.py"""
+
+import cython
+
+from ..signature import SignatureType
+
+
+cdef unsigned int UINT32_SIZE
+cdef unsigned int HEADER_ARRAY_OF_STRUCT_SIGNATURE_POSITION
+cdef unsigned int HEADER_SIGNATURE_SIZE
+
+cdef class Unmarshaller:
+
+    cdef object unix_fds
+    cdef object buf
+    cdef object view
+    cdef unsigned int pos
+    cdef object stream
+    cdef object sock
+    cdef object _message
+    cdef object readers
+    cdef unsigned int body_len
+    cdef unsigned int serial
+    cdef unsigned int header_len
+    cdef object message_type
+    cdef object flag
+    cdef unsigned int msg_len
+    cdef object _uint32_unpack
+
+
+    @cython.locals(
+        start_len=cython.ulong,
+        missing_bytes=cython.ulong,
+    )
+    cpdef read_to_pos(self, unsigned long pos)
+
+    cpdef read_string_cast(self, type_ = *)
+
+    @cython.locals(
+        beginning_pos=cython.ulong,
+        array_length=cython.uint,
+    )
+    cpdef read_array(self, object type_)
+
+    @cython.locals(
+        o=cython.ulong,
+        signature_len=cython.uint,
+    )
+    cpdef read_signature(self, type_ = *)
+
+    @cython.locals(
+        endian=cython.uint,
+        protocol_version=cython.uint,
+    )
+    cpdef _read_header(self)
+
+    @cython.locals(
+        beginning_pos=cython.ulong,
+        o=cython.ulong,
+        signature_len=cython.uint,
+    )
+    cpdef header_fields(self, unsigned int header_length)
diff --git a/src/dbus_fast/_private/unmarshaller.py b/src/dbus_fast/_private/unmarshaller.py
index afd0f10..4a38c59 100644
--- a/src/dbus_fast/_private/unmarshaller.py
+++ b/src/dbus_fast/_private/unmarshaller.py
@@ -128,12 +128,6 @@ class MarshallerStreamEndError(Exception):
 #
 class Unmarshaller:
 
-    buf: bytearray
-    view: memoryview
-    message: Message
-    unpack: Dict[str, Struct]
-    readers: READER_TYPE
-
     __slots__ = (
         "unix_fds",
         "buf",
@@ -141,7 +135,7 @@ class Unmarshaller:
         "pos",
         "stream",
         "sock",
-        "message",
+        "_message",
         "readers",
         "body_len",
         "serial",
@@ -159,17 +153,22 @@ class Unmarshaller:
         self.pos = 0
         self.stream = stream
         self.sock = sock
-        self.message = None
-        self.readers = None
-        self.body_len: int | None = None
-        self.serial: int | None = None
-        self.header_len: int | None = None
+        self._message: Message | None = None
+        self.readers: Dict[str, READER_TYPE] = {}
+        self.body_len = 0
+        self.serial = 0
+        self.header_len = 0
         self.message_type: MessageType | None = None
         self.flag: MessageFlag | None = None
         self.msg_len = 0
         # Only set if we cannot cast
         self._uint32_unpack: Callable | None = None
 
+    @property
+    def message(self) -> Message:
+        """Return the message that has been unmarshalled."""
+        return self._message
+
     def read_sock(self, length: int) -> bytes:
         """reads from the socket, storing any fds sent and handling errors
         from the read itself"""
@@ -192,7 +191,7 @@ class Unmarshaller:
 
         return msg
 
-    def read_to_pos(self, pos: int) -> None:
+    def read_to_pos(self, pos) -> None:
         """
         Read from underlying socket into buffer.
 
@@ -219,20 +218,20 @@ class Unmarshaller:
         if len(data) + start_len != pos:
             raise MarshallerStreamEndError()
 
-    def read_boolean(self, _=None):
+    def read_boolean(self, type_=None) -> bool:
         return bool(self.readers[UINT32_SIGNATURE.token](self, UINT32_SIGNATURE))
 
-    def read_string_cast(self, _=None):
+    def read_string_cast(self, type_=None) -> str:
         """Read a string using cast."""
         self.pos += UINT32_SIZE + (-self.pos & (UINT32_SIZE - 1))  # align
         str_start = self.pos
         # read terminating '\0' byte as well (str_length + 1)
-        self.pos += (
-            self.view[self.pos - UINT32_SIZE : self.pos].cast(UINT32_CAST)[0] + 1
-        )
-        return self.buf[str_start : self.pos - 1].decode()
+        start_pos = self.pos - UINT32_SIZE
+        self.pos += self.view[start_pos : self.pos].cast(UINT32_CAST)[0] + 1
+        end_pos = self.pos - 1
+        return self.buf[str_start:end_pos].decode()
 
-    def read_string_unpack(self, _=None):
+    def read_string_unpack(self, type_=None) -> str:
         """Read a string using unpack."""
         self.pos += UINT32_SIZE + (-self.pos & (UINT32_SIZE - 1))  # align
         str_start = self.pos
@@ -240,34 +239,34 @@ class Unmarshaller:
         self.pos += self._uint32_unpack(self.view, str_start - UINT32_SIZE)[0] + 1
         return self.buf[str_start : self.pos - 1].decode()
 
-    def read_signature(self, _=None):
+    def read_signature(self, type_=None) -> str:
         signature_len = self.view[self.pos]  # byte
         o = self.pos + 1
         # read terminating '\0' byte as well (str_length + 1)
         self.pos = o + signature_len + 1
         return self.buf[o : o + signature_len].decode()
 
-    def read_variant(self, _=None):
+    def read_variant(self, type_=None) -> Variant:
         tree = SignatureTree._get(self.read_signature())
         # verify in Variant is only useful on construction not unmarshalling
         return Variant(
             tree, self.readers[tree.types[0].token](self, tree.types[0]), verify=False
         )
 
-    def read_struct(self, type_: SignatureType):
+    def read_struct(self, type_=None) -> List[Any]:
         self.pos += -self.pos & 7  # align 8
+        readers = self.readers
         return [
-            self.readers[child_type.token](self, child_type)
-            for child_type in type_.children
+            readers[child_type.token](self, child_type) for child_type in type_.children
         ]
 
-    def read_dict_entry(self, type_: SignatureType):
+    def read_dict_entry(self, type_: SignatureType) -> Dict[Any, Any]:
         self.pos += -self.pos & 7  # align 8
         return self.readers[type_.children[0].token](
             self, type_.children[0]
         ), self.readers[type_.children[1].token](self, type_.children[1])
 
-    def read_array(self, type_: SignatureType):
+    def read_array(self, type_: SignatureType) -> List[Any]:
         self.pos += -self.pos & 3  # align 4 for the array
         self.pos += (
             -self.pos & (UINT32_SIZE - 1)
@@ -289,25 +288,26 @@ class Unmarshaller:
             return self.buf[self.pos - array_length : self.pos]
 
         beginning_pos = self.pos
+        readers = self.readers
 
         if child_type.token == "{":
             result_dict = {}
             while self.pos - beginning_pos < array_length:
                 self.pos += -self.pos & 7  # align 8
-                key = self.readers[child_type.children[0].token](
+                key = readers[child_type.children[0].token](
                     self, child_type.children[0]
                 )
-                result_dict[key] = self.readers[child_type.children[1].token](
+                result_dict[key] = readers[child_type.children[1].token](
                     self, child_type.children[1]
                 )
             return result_dict
 
         result_list = []
         while self.pos - beginning_pos < array_length:
-            result_list.append(self.readers[child_type.token](self, child_type))
+            result_list.append(readers[child_type.token](self, child_type))
         return result_list
 
-    def header_fields(self, header_length):
+    def header_fields(self, header_length) -> Dict[str, Any]:
         """Header fields are always a(yv)."""
         beginning_pos = self.pos
         headers = {}
@@ -326,7 +326,7 @@ class Unmarshaller:
             )
         return headers
 
-    def _read_header(self):
+    def _read_header(self) -> None:
         """Read the header of the message."""
         # Signature is of the header is
         # BYTE, BYTE, BYTE, BYTE, UINT32, UINT32, ARRAY of STRUCT of (BYTE,VARIANT)
@@ -368,7 +368,7 @@ class Unmarshaller:
         header_fields = self.header_fields(self.header_len)
         self.pos += -self.pos & 7  # align 8
         tree = SignatureTree._get(header_fields.get(HeaderField.SIGNATURE.name, ""))
-        self.message = Message(
+        self._message = Message(
             destination=header_fields.get(HEADER_DESTINATION),
             path=header_fields.get(HEADER_PATH),
             interface=header_fields.get(HEADER_INTERFACE),