diff --git a/.github/actions/test-driver/action.yml b/.github/actions/test-driver/action.yml
index 47c0fab83f..7e6b71bcb0 100644
--- a/.github/actions/test-driver/action.yml
+++ b/.github/actions/test-driver/action.yml
@@ -32,6 +32,8 @@ runs:
         ./test_driver.sh \
         --testtype CUSTOM \
         --env env/docker.sh \
+        --buildjobs $(nproc) \
+        --testjobs $(nproc) \
         --tpls ${{ inputs.tpls }} \
         --sunrealtype ${{ inputs.precision }} \
         --indexsize ${{ inputs.indexsize }}
diff --git a/.github/workflows/docs-pdfs.yml b/.github/workflows/docs-pdfs.yml
index b2745ebb22..14ba48fff1 100644
--- a/.github/workflows/docs-pdfs.yml
+++ b/.github/workflows/docs-pdfs.yml
@@ -39,7 +39,7 @@ jobs:
           pip install -r doc/requirements.txt
 
       - name: Build docs
-        run: cd doc/install_guide && make latexpdf
+        run: cd doc/install_guide && make -j$(nproc) latexpdf
 
       - name: Archive files from failed build
         uses: actions/upload-artifact@v4
@@ -91,7 +91,7 @@ jobs:
           pip install -r doc/requirements.txt
 
       - name: Build docs
-        run: cd doc/${{matrix.package}}/guide && make latexpdf
+        run: cd doc/${{matrix.package}}/guide && make -j$(nproc) latexpdf
         # run: cd doc/${{matrix.package}}/${{matrix.type}} && make latexpdf
 
       - name: Archive files from failed build
@@ -146,7 +146,7 @@ jobs:
           pip install -r doc/requirements.txt
 
       - name: Build docs
-        run: cd doc/${{matrix.package}}/examples && make latexpdf
+        run: cd doc/${{matrix.package}}/examples && make -j$(nproc) latexpdf
 
       - name: Archive files from failed build
         uses: actions/upload-artifact@v4
@@ -191,7 +191,7 @@ jobs:
           submodules: true
 
       - name: Build docs
-        run: cd doc/${{matrix.package}} && make ex
+        run: cd doc/${{matrix.package}} && make -j$(nproc) ex
 
       - name: Archive files from failed build
         uses: actions/upload-artifact@v4
diff --git a/.github/workflows/macos-latest.yml b/.github/workflows/macos-latest.yml
index ae0eb137d2..86711ce552 100644
--- a/.github/workflows/macos-latest.yml
+++ b/.github/workflows/macos-latest.yml
@@ -35,10 +35,14 @@ jobs:
 
     - name: Build
       # Build your program with the given configuration
-      run: cmake --build ${{github.workspace}}/build --config ${{env.BUILD_TYPE}}
+      run: |
+        cmake \
+        --build ${{github.workspace}}/build \
+        --parallel $(sysctl -n hw.ncpu) \
+        --config ${{env.BUILD_TYPE}}
 
     - name: Test
       working-directory: ${{github.workspace}}/build
       # Execute tests defined by the CMake configuration.
       # See https://cmake.org/cmake/help/latest/manual/ctest.1.html for more detail
-      run: ctest -C ${{env.BUILD_TYPE}}
+      run: ctest -C ${{env.BUILD_TYPE}} --parallel $(sysctl -n hw.ncpu)
diff --git a/.github/workflows/ubuntu-clang-latest.yml b/.github/workflows/ubuntu-clang-latest.yml
index 2031797a42..63028044ae 100644
--- a/.github/workflows/ubuntu-clang-latest.yml
+++ b/.github/workflows/ubuntu-clang-latest.yml
@@ -47,13 +47,18 @@ jobs:
 
     - name: Build
       # Build your program with the given configuration
-      run: cmake --build ${{github.workspace}}/build --config ${{env.BUILD_TYPE}}
+      run: |
+        cmake \
+        --build ${{github.workspace}}/build \
+        --parallel $(nproc) \
+        --config ${{env.BUILD_TYPE}}
 
     - name: Test
       # Run logging tests
       run: |
         ctest \
         --test-dir ${{github.workspace}}/build \
+        --parallel $(nproc) \
         --label-regex logging \
         --verbose
 
@@ -98,7 +103,11 @@ jobs:
 
     - name: Build
       # Build your program with the given configuration
-      run: cmake --build ${{github.workspace}}/build --config ${{env.BUILD_TYPE}}
+      run: |
+        cmake \
+        --build ${{github.workspace}}/build \
+        --parallel $(nproc) \
+        --config ${{env.BUILD_TYPE}}
 
     - name: Archive build files from failed build
       uses: actions/upload-artifact@v4
diff --git a/.github/workflows/ubuntu-latest-oneapi.yml b/.github/workflows/ubuntu-latest-oneapi.yml
index bebd04efad..06c13a33a8 100644
--- a/.github/workflows/ubuntu-latest-oneapi.yml
+++ b/.github/workflows/ubuntu-latest-oneapi.yml
@@ -42,4 +42,8 @@ jobs:
         -D ENABLE_SYCL=ON
 
     - name: Build
-      run: cmake --build ${{github.workspace}}/build --config ${{env.BUILD_TYPE}}
+      run: |
+        cmake \
+        --build ${{github.workspace}}/build \
+        --parallel $(nproc) \
+        --config ${{env.BUILD_TYPE}}
diff --git a/.github/workflows/windows-latest-intel.yml b/.github/workflows/windows-latest-intel.yml
index 4e3f292e04..93fafcda11 100644
--- a/.github/workflows/windows-latest-intel.yml
+++ b/.github/workflows/windows-latest-intel.yml
@@ -33,18 +33,18 @@ jobs:
       run: cmake -G "Ninja" -B ${{github.workspace}}/build_static -DCMAKE_BUILD_TYPE=${{env.BUILD_TYPE}} -DCMAKE_C_FLAGS=-Wno-deprecated-declarations -DCMAKE_C_COMPILER=icx-cl -DCMAKE_CXX_COMPILER=icx-cl -DCMAKE_Fortran_COMPILER=ifx -DBUILD_STATIC_LIBS=ON -DBUILD_SHARED_LIBS=OFF -DBUILD_FORTRAN_MODULE_INTERFACE=ON -DSUNDIALS_BUILD_WITH_PROFILING=ON -DSUNDIALS_TEST_ENABLE_UNIT_TESTS=OFF -DEXAMPLES_ENABLE_CXX=ON
 
     - name: Build (Static)
-      run: cmake --build ${{github.workspace}}/build_static --verbose
+      run: cmake --build ${{github.workspace}}/build_static --parallel $NUMBER_OF_PROCESSORS --verbose
 
     - name: Test (Static)
       working-directory: ${{github.workspace}}/build_static
-      run: ctest -C ${{env.BUILD_TYPE}} --output-on-failure
+      run: ctest -C ${{env.BUILD_TYPE}} --output-on-failure --parallel $NUMBER_OF_PROCESSORS
 
     - name: Configure CMake (Shared)
       run: cmake -G "Ninja" -B ${{github.workspace}}/build_shared -DCMAKE_BUILD_TYPE=${{env.BUILD_TYPE}} -DCMAKE_C_FLAGS=-Wno-deprecated-declarations -DCMAKE_C_COMPILER=icx-cl -DCMAKE_CXX_COMPILER=icx-cl -DCMAKE_Fortran_COMPILER=ifx -DBUILD_STATIC_LIBS=OFF -DBUILD_SHARED_LIBS=ON -DBUILD_FORTRAN_MODULE_INTERFACE=ON -DSUNDIALS_BUILD_WITH_PROFILING=ON -DSUNDIALS_TEST_ENABLE_UNIT_TESTS=OFF -DEXAMPLES_ENABLE_CXX=ON
 
     - name: Build (Shared)
-      run: cmake --build ${{github.workspace}}/build_shared --verbose
+      run: cmake --build ${{github.workspace}}/build_shared --parallel $NUMBER_OF_PROCESSORS --verbose
 
     - name: Test (Shared)
       working-directory: ${{github.workspace}}/build_shared
-      run: ctest -C ${{env.BUILD_TYPE}} --output-on-failure
+      run: ctest -C ${{env.BUILD_TYPE}} --output-on-failure --parallel $NUMBER_OF_PROCESSORS
diff --git a/.github/workflows/windows-latest-mingw.yml b/.github/workflows/windows-latest-mingw.yml
index bb103d049f..e461375feb 100644
--- a/.github/workflows/windows-latest-mingw.yml
+++ b/.github/workflows/windows-latest-mingw.yml
@@ -64,12 +64,12 @@ jobs:
 
     - name: Build (Static)
       # Build program
-      run: cmake --build ${GITHUB_WORKSPACE}/build_static --verbose
+      run: cmake --build ${GITHUB_WORKSPACE}/build_static --parallel $NUMBER_OF_PROCESSORS --verbose
 
     - name: Test (Static)
       working-directory: ${{github.workspace}}/build_static
       # Execute tests
-      run: ctest --output-on-failure
+      run: ctest --output-on-failure --parallel $NUMBER_OF_PROCESSORS
 
     # TODO(CJB): shared libraries with the fortran interfaces turned on
     # fail to link correctly with this toolchain see https://github.com/LLNL/sundials/issues/507.
@@ -91,9 +91,9 @@ jobs:
 
     - name: Build (Shared)
       # Build program
-      run: cmake --build ${GITHUB_WORKSPACE}/build_shared --verbose
+      run: cmake --build ${GITHUB_WORKSPACE}/build_shared --parallel $NUMBER_OF_PROCESSORS --verbose
 
     - name: Test (Shared)
       working-directory: ${{github.workspace}}/build_shared
       # Execute tests
-      run: ctest --output-on-failure
+      run: ctest --output-on-failure --parallel $NUMBER_OF_PROCESSORS
diff --git a/.github/workflows/windows-latest.yml b/.github/workflows/windows-latest.yml
index ea1c4bbcfc..ee648a2b42 100644
--- a/.github/workflows/windows-latest.yml
+++ b/.github/workflows/windows-latest.yml
@@ -23,8 +23,8 @@ jobs:
       run: cmake -G "Visual Studio 17 2022" -B ${{github.workspace}}/build -DSUNDIALS_BUILD_WITH_PROFILING=ON -DSUNDIALS_TEST_ENABLE_UNIT_TESTS=ON -DEXAMPLES_ENABLE_CXX=ON
 
     - name: Build
-      run: cmake --build ${{github.workspace}}/build --config ${{env.BUILD_TYPE}} --verbose
+      run: cmake --build ${{github.workspace}}/build --config ${{env.BUILD_TYPE}} --parallel $NUMBER_OF_PROCESSORS --verbose
 
     - name: Test
       working-directory: ${{github.workspace}}/build
-      run: ctest -C ${{env.BUILD_TYPE}} --output-on-failure
+      run: ctest -C ${{env.BUILD_TYPE}} --output-on-failure --parallel $NUMBER_OF_PROCESSORS