diff --git a/.github/workflows/CI-windows.yml b/.github/workflows/CI-windows.yml
index a39917812..67816efc6 100644
--- a/.github/workflows/CI-windows.yml
+++ b/.github/workflows/CI-windows.yml
@@ -49,7 +49,8 @@ jobs:
           )
         env:
           # see https://www.pcre.org/original/changelog.txt
-          PCRE_VERSION: 8.44  
+          PCRE_VERSION: 8.44
+          CL: /MP
 
       - name: Install Z3 library
         run: |
@@ -80,6 +81,8 @@ jobs:
           cd gui || exit /b !errorlevel!
           qmake HAVE_QCHART=yes || exit /b !errorlevel!
           nmake release || exit /b !errorlevel!
+        env:
+          CL: /MP
       
       - name: Deploy GUI
         if: matrix.arch == 'x64'
diff --git a/.github/workflows/release-windows.yml b/.github/workflows/release-windows.yml
index 0f81ca9f9..c22ba17be 100644
--- a/.github/workflows/release-windows.yml
+++ b/.github/workflows/release-windows.yml
@@ -70,6 +70,8 @@ jobs:
           cd gui
           qmake HAVE_QCHART=yes
           nmake release
+        env:
+          CL: /MP
 
       - name: Deploy app
         run: |
diff --git a/appveyor.yml b/appveyor.yml
index 8167e356c..2906c4b6e 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -47,6 +47,8 @@ build_script:
   - msbuild "cppcheck.sln" /consoleloggerparameters:Verbosity=minimal /target:Build /property:Configuration="%configuration%";Platform=%platform% /p:PlatformToolset=%PlatformToolset% /maxcpucount /logger:"C:\Program Files\AppVeyor\BuildAgent\Appveyor.MSBuildLogger.dll"
   # the following builds are Debug ones so do not perform them in Release jobs
   - 'IF "%configuration%" == "Release" exit /b 0'
+  # use all available processes for nmake
+  - set CL=/MP
   # cmake..
   - mkdir build
   - cd build