diff --git a/.github/workflows/ci-slow.yaml b/.github/workflows/ci-slow.yaml
new file mode 100644
index 0000000..76f8ca2
--- /dev/null
+++ b/.github/workflows/ci-slow.yaml
@@ -0,0 +1,44 @@
+name: CI-slow
+
+on: workflow_dispatch
+
+jobs:
+  unit-tests:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      #max-parallel: 1
+      matrix:
+        include:
+          - python-version: '3.11'
+            os: macos-latest
+            EXTRA: true
+          - python-version: '3.12'
+            os: macos-latest
+            EXTRA: true
+          - python-version: '3.7'
+            os: windows-latest
+            EXTRA: true
+          - python-version: '3.12'
+            os: windows-latest
+            EXTRA: true
+    steps:
+      - name: checkout
+        uses: actions/checkout@v4
+
+      - name: Set up Python ${{ matrix.python-version }}
+        uses: actions/setup-python@v5
+        with:
+          python-version: ${{ matrix.python-version }}
+
+      - name: Install setuptools on python 3.12+
+        if: ${{ matrix.python-version >= '3.12' }}
+        run: |
+          pip install setuptools
+
+      - name: Install cdx_toolkit
+        run: pip install .[test]
+
+      - name: Run tests
+        run: |
+          make test_coverage
diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index c78705e..4875825 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -25,18 +25,6 @@ jobs:
             EXTRA: true
             env:
               LOGLEVEL=DEBUG
-          - python-version: '3.11'
-            os: macos-latest
-            EXTRA: true
-          - python-version: '3.12'
-            os: macos-latest
-            EXTRA: true
-          - python-version: '3.7'
-            os: windows-latest
-            EXTRA: true
-          - python-version: '3.12'
-            os: windows-latest
-            EXTRA: true
           - python-version: '3.7'
             os: ubuntu-20.04  # oldest version on github actions
             EXTRA: true