diff --git a/.github/actions/supercollider/action.yml b/.github/actions/supercollider/action.yml
index 30b52faae..39ac7a182 100644
--- a/.github/actions/supercollider/action.yml
+++ b/.github/actions/supercollider/action.yml
@@ -16,7 +16,6 @@ runs:
       run: |
         git clone --quiet --recursive --branch ${{ inputs.branch }} ${{ inputs.origin }} /tmp/supercollider
         cd /tmp/supercollider
-        mkdir build
         echo "SC_COMMIT_SHA=$(git rev-parse HEAD)" >> $GITHUB_ENV
         if [ "$RUNNER_OS" == "Linux" ]; then
           echo "SC_ORIGIN_MD5=$(echo ${{inputs.origin}} | md5sum | head -c 7)" >> $GITHUB_ENV
@@ -27,110 +26,127 @@ runs:
           exit 1
         fi
       shell: bash
-    - name: Cache SuperCollider
-      id: cache
+    - name: Cache current date
+      id: current-date
+      run: echo "stamp=$(date '+%Y-%m-%d')" >> $GITHUB_OUTPUT
+      shell: bash
+    - name: '[Linux] Cache ccache'
+      if: runner.os == 'Linux'
+      uses: actions/cache@v3
+      with:
+        path: ~/.ccache
+        key: ccache-${{ runner.os }}-${{ steps.current-date.outputs.stamp }}
+        restore-keys: ccache-${{ runner.os }}-
+    - name: '[macOS] Cache ccache'
+      if: runner.os == 'macOS'
+      uses: actions/cache@v3
+      with:
+        path: ~/Library/Caches/ccache
+        key: ccache-${{ runner.os }}-${{ steps.current-date.outputs.stamp }}
+        restore-keys: ccache-${{ runner.os }}-
+    - name: '[macOS] Cache Homebrew'
+      id: cache-homebrew
+      if: runner.os == 'macOS'
       uses: actions/cache@v3
       with:
-        path: /tmp/supercollider/build
-        key: ${{ runner.os }}-supercollider-${{ env.SC_ORIGIN_MD5 }}-${{ env.SC_COMMIT_SHA }}
-        restore-keys: |
-          ${{ runner.os }}-supercollider-
-    - name: Validate cache
-      run: echo "Cached? ${{ steps.cache.outputs.cache-hit }}"
+        path: ~/Library/Caches/Homebrew/downloads
+        key: homebrew-${{ runner.os }}-${{ steps.current-date.outputs.stamp }}
+        restore-keys: homebrew-${{ runner.os }}-
+    - name: '[macOS] Cleanup Homebrew'
+      if: runner.os == 'macOS' && !steps.cache-homebrew.outputs.cache-hit
+      run: rm -rf $(brew --cache)
       shell: bash
-    - name: Install SuperCollider Deps
+    - name: '[Linux] Install dependencies'
+      if: runner.os == 'Linux'
       run: |
-        echo "Installing SuperCollider deps..."
-        if [ "$RUNNER_OS" == "Linux" ]; then
-          export DEBIAN_FRONTEND=noninteractive
-          sudo apt-get update --yes
-          sudo apt-get install --yes \
-            alsa-oss \
-            alsa-utils \
-            build-essential \
-            cmake \
-            jackd2 \
-            libasound2-dev \
-            libavahi-client-dev \
-            libfftw3-dev \
-            libicu-dev \
-            libjack-jackd2-dev \
-            libreadline6-dev \
-            libsndfile1-dev \
-            libudev-dev \
-            libxt-dev \
-            pkg-config
-        elif [ "$RUNNER_OS" == "macOS" ]; then
-          brew install \
-            cmake \
-            fftw \
-            git \
-            jack \
-            libsndfile \
-            portaudio \
-            qt5 \
-            readline
-          echo "Update ld cache"
-          sudo update_dyld_shared_cache
-        else
-          echo "$RUNNER_OS not supported"
-          exit 1
-        fi
+        sudo apt-get update
+        sudo apt-get install --yes \
+          build-essential \
+          ccache \
+          cmake \
+          emacs \
+          jackd2 \
+          libasound2-dev \
+          libavahi-client-dev \
+          libfftw3-dev \
+          libicu-dev \
+          libjack-jackd2-dev \
+          libreadline6-dev \
+          libsndfile1-dev \
+          libudev-dev \
+          libxt-dev \
+          pkg-config
       shell: bash
-    - name: Prep SuperCollider build
-      if: steps.cache.outputs.cache-hit != 'true'
+    - name: '[macOS] Install dependencies'
+      if: runner.os == 'macOS'
       run: |
-        echo "[Cache Miss] Configuring SuperCollider..."
-        if [ "$RUNNER_OS" == "Linux" ]; then
-          cmake \
-            --debug-output \
-            -DCMAKE_build_TYPE=Release \
-            -DSC_EL=OFF \
-            -DSC_IDE=OFF \
-            -DSC_QT=OFF \
-            -DSUPERNOVA=ON \
-            /tmp/supercollider
-        elif [ "$RUNNER_OS" == "macOS" ]; then
-          cmake \
-            -DCMAKE_PREFIX_PATH=`brew --prefix qt5` \
-            -DSUPERNOVA=ON \
-            -G Xcode \
-            /tmp/supercollider
-        else
-          echo "$RUNNER_OS not supported"
-          exit 1
-        fi
+        brew install \
+          ccache \
+          fftw \
+          jack \
+          portaudio \
+          qt5 \
+          readline
+        echo "/usr/local/opt/ccache/libexec" >> $GITHUB_PATH
       shell: bash
-      working-directory: /tmp/supercollider/build
-    - name: Build SuperCollider
-      if: steps.cache.outputs.cache-hit != 'true'
+    - name: '[Linux] Configure'
+      if: runner.os == 'Linux'
       run: |
-        echo "[Cache Miss] Building SuperCollider..."
-        if [ "$RUNNER_OS" == "Linux" ]; then
-          make
-        elif [ "$RUNNER_OS" == "macOS" ]; then
-          cmake --build . --target install --config RelWithDebInfo
-        else
-          echo "$RUNNER_OS not supported"
-          exit 1
-        fi
+        mkdir /tmp/supercollider/build
+        cd /tmp/supercollider/build
+        cmake \
+          -DSC_ED=OFF \
+          -DSC_EL=OFF \
+          -DSC_IDE=OFF \
+          -DSC_VIM=OFF \
+          -DSC_QT=OFF \
+          -DSUPERNOVA=ON \
+          ..
       shell: bash
-      working-directory: /tmp/supercollider/build
-    - name: Install SuperCollider
+    - name: '[macOS] Configure'
+      if: runner.os == 'macOS'
       run: |
-        echo "Installing SuperCollider..."
-        if [ "$RUNNER_OS" == "Linux" ]; then
-          sudo make install/fast
-          mkdir -p /home/runner/.local/share/SuperCollider/synthdefs
-        elif [ "$RUNNER_OS" == "macOS" ]; then
-          echo "PATH=/tmp/supercollider/build/Install/SuperCollider/SuperCollider.app/Contents/MacOS:/tmp/supercollider/build/Install/SuperCollider/SuperCollider.app/Contents/Resources/:$PATH" >> $GITHUB_ENV
-          mkdir -p "/Users/runner/Library/Application Support/SuperCollider/synthdefs"
-        else
-          echo "$RUNNER_OS not supported"
-          exit 1
-        fi
+        mkdir /tmp/supercollider/build
+        cd /tmp/supercollider/build
+        cmake \
+          -DCMAKE_PREFIX_PATH=`brew --prefix qt5` \
+          -DRULE_LAUNCH_COMPILE=ccache \
+          -DSC_ED=OFF \
+          -DSC_EL=OFF \
+          -DSC_IDE=ON \
+          -DSC_QT=ON \
+          -DSC_VIM=OFF \
+          -DSUPERNOVA=ON \
+          -G Xcode \
+          ..
+      shell: bash
+    - name: '[Linux] Build'
+      if: runner.os == 'Linux'
+      run: |
+        cd /tmp/supercollider/build
+        make -j2
+      shell: bash
+    - name: '[macOS] Build'
+      if: runner.os == 'macOS'
+      run: cmake --build /tmp/supercollider/build --config Release --target install
+      shell: bash
+    - name: '[Linux] Install'
+      if: runner.os == 'Linux'
+      run: |
+        cd /tmp/supercollider/build
+        sudo make install -j2
+        mkdir -p /home/runner/.local/share/SuperCollider/synthdefs
+      shell: bash
+    - name: '[macOS] Install'
+      if: runner.os == 'macOS'
+      run: |
+        echo "/tmp/supercollider/build/Install/SuperCollider/SuperCollider.app/Contents/MacOS" >> $GITHUB_PATH
+        echo "/tmp/supercollider/build/Install/SuperCollider/SuperCollider.app/Contents/Resources" >> $GITHUB_PATH
+        mkdir -p "/Users/runner/Library/Application Support/SuperCollider/synthdefs"
+      shell: bash
+    - name: Debug ccache
+      run: ccache --show-stats --show-config
       shell: bash
-      working-directory: /tmp/supercollider/build
     - name: Setup Jack
       run: |
         echo "Setting up Jack..."
@@ -159,4 +175,3 @@ runs:
         sleep 5
         killall supernova
       shell: bash
-    
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 2735e1e03..dd6e401ff 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -107,18 +107,6 @@ jobs:
     timeout-minutes: 45
     steps:
     - uses: actions/checkout@v3
-    - name: Setup cache timestamp
-      id: current-date
-      run: |
-        echo "::set-output name=stamp::$(date '+%Y-%m-%d')"
-        echo "::set-output name=week::$(date '+%V')"
-    - name: Cache Homebrew
-      uses: actions/cache@v3
-      if: ${{ matrix.os == 'macos-latest' }}
-      with:
-        path: ~/Library/Caches/Homebrew/downloads
-        key: ${{ runner.os }}-homebrew-${{ steps.current-date.outputs.stamp }}
-        restore-keys: ${{ runner.os }}-homebrew-
     - name: Set up Python ${{ matrix.python-version }}
       uses: actions/setup-python@v4
       with:
@@ -156,6 +144,8 @@ jobs:
       run: python -c "from supriya.realtime.shm import ServerSHM; print(ServerSHM)"
     - name: Install Supriya test dependencies
       run: pip install -e .[test]
+    - name: Install ffmpeg
+      uses: FedericoCarboni/setup-ffmpeg@v2
     - name: Install additional packages
       shell: bash
       run: |
@@ -164,17 +154,18 @@ jobs:
           sudo apt-get update --yes
           sudo apt-get install --yes \
             espeak \
-            ffmpeg \
             graphviz \
             lame
         elif [ "$RUNNER_OS" == "macOS" ]; then
-          brew install ffmpeg graphviz lame
+          brew install \
+            graphviz
         elif [ "$RUNNER_OS" == "Windows" ]; then
-          choco install ffmpeg graphviz lame
+          choco install \
+            graphviz
         fi
     - name: Run Pytest
       run: pytest --cov supriya
-      timeout-minutes: 10
+      timeout-minutes: 15
     - name: Check for stray processes (Non-Windows)
       if: ${{ matrix.os != 'windows-latest' }}
       run: |
diff --git a/docs/source/realtime/nodes.rst b/docs/source/realtime/nodes.rst
index c8e920283..8b42e076f 100644
--- a/docs/source/realtime/nodes.rst
+++ b/docs/source/realtime/nodes.rst
@@ -98,6 +98,19 @@ first::
 
         >>> server.add_group(add_action="add to head")
 
+.. note::
+
+    When using :term:`supernova` as your server executable, you can create
+    _parallel_ groups by specifying ``parallel=True`` in any call you would use
+    to create a group::
+
+        >>> server.add_group(parallel=True)
+
+    Parallel groups will process their child nodes via multiple threads.
+    Because the order of node processing within a parallel group is
+    non-deterministic they're best suited for summing together signals rather
+    than processing in-place.
+
 Creating synths
 ```````````````
 
diff --git a/setup.py b/setup.py
index c9d37e222..4434c9fd5 100644
--- a/setup.py
+++ b/setup.py
@@ -45,4 +45,5 @@ def read_version():
         packages=find_packages(include=["supriya", "supriya.*"])
         + ["supriya.assets.audio", "supriya.assets.audio.birds"],
         version=read_version(),
+        package_data={"supriya": ["py.typed"]},
     )
diff --git a/supriya/providers.py b/supriya/providers.py
index bc9ff0d85..c2d28a22f 100644
--- a/supriya/providers.py
+++ b/supriya/providers.py
@@ -207,8 +207,11 @@ def add_group(
         *,
         add_action: AddActionLike = AddAction.ADD_TO_HEAD,
         name: Optional[str] = None,
+        parallel: bool = False,
     ) -> "GroupProxy":
-        return self.provider.add_group(add_action=add_action, target_node=self)
+        return self.provider.add_group(
+            add_action=add_action, target_node=self, parallel=parallel
+        )
 
     def add_synth(
         self,
@@ -268,7 +271,6 @@ class GroupProxy(NodeProxy):
     def as_add_request(
         self, add_action, target_node
     ) -> Union[commands.GroupNewRequest, commands.ParallelGroupNewRequest]:
-
         request_method = commands.GroupNewRequest
         if self.parallel:
             request_method = commands.ParallelGroupNewRequest
diff --git a/supriya/py.typed b/supriya/py.typed
new file mode 100644
index 000000000..e69de29bb
diff --git a/supriya/synthdefs/synthdefs.py b/supriya/synthdefs/synthdefs.py
index 5804b33e6..ef72efc18 100644
--- a/supriya/synthdefs/synthdefs.py
+++ b/supriya/synthdefs/synthdefs.py
@@ -1026,7 +1026,7 @@ def compile(self):
             sc_file_path = directory_path / f"{self.name}.sc"
             sc_file_path.write_text(sc_input)
             command = [str(sclang_path), "-D", str(sc_file_path)]
-            subprocess.run(command)
+            subprocess.run(command, timeout=10)
             result = (directory_path / f"{self.name}.scsyndef").read_bytes()
         return bytes(result)