diff --git a/.github/workflows/macos.yml b/.github/workflows/macos.yml
index 3647bc02..dbace9c3 100644
--- a/.github/workflows/macos.yml
+++ b/.github/workflows/macos.yml
@@ -12,6 +12,6 @@ jobs:
     - name: cmake
       run: cmake -S . -B build
     - name: build
-      run: cmake --build build
+      run: cmake --build build --parallel 10
     - name: test
       run: cd build ; ctest -j 10
diff --git a/.github/workflows/ubuntu.yml b/.github/workflows/ubuntu.yml
index 902afc5b..77927966 100644
--- a/.github/workflows/ubuntu.yml
+++ b/.github/workflows/ubuntu.yml
@@ -12,6 +12,6 @@ jobs:
     - name: cmake
       run: cmake -S . -B build
     - name: build
-      run: cmake --build build
+      run: cmake --build build --parallel 10
     - name: test
       run: cd build ; ctest -j 10
diff --git a/.github/workflows/windows.yml b/.github/workflows/windows.yml
index 3ba59059..d3fb8cbd 100644
--- a/.github/workflows/windows.yml
+++ b/.github/workflows/windows.yml
@@ -12,6 +12,6 @@ jobs:
     - name: cmake
       run: cmake -S . -B build -G "Visual Studio 16 2019"
     - name: build
-      run: cmake --build build
+      run: cmake --build build --parallel 10
     - name: test
-      run: cd build ; ctest -j 10
+      run: cd build ; ctest -j 10 -C Release