diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
index 9b007ee7..d9e5c871 100644
--- a/.github/workflows/CI.yml
+++ b/.github/workflows/CI.yml
@@ -14,12 +14,36 @@ concurrency:
   cancel-in-progress: true
 
 jobs:
+  changes:
+    runs-on: ubuntu-latest
+    permissions:
+      pull-requests: read
+    outputs:
+      groups: ${{ steps.changes.outputs.groups }}
+    steps:
+    - uses: actions/checkout@v4
+    - uses: dorny/paths-filter@v2
+      id: filter
+      with:
+        filters: |
+          sectors:
+            - 'src/sectors/**'
+          fusiontrees: 
+            - 'src/sectors/**'
+            - 'src/fusiontrees/**'
+          spaces:
+            - 'src/spaces/**'
+          
   test:
-    name: Julia ${{ matrix.version }} - ${{ matrix.os }} - ${{ matrix.arch }}
+    needs: changes
+    name: "${{ matrix.group }} : Julia ${{ matrix.version }} - ${{ matrix.os }} - ${{ matrix.arch }}"
     runs-on: ${{ matrix.os }}
     strategy:
       fail-fast: false
       matrix:
+        group:
+          - ${{ fromJSON(needs.changes.outputs.groups) }}
+          - 'tensors'
         version:
           - '1.6' # LTS version
           - '1' # automatically expands to the latest stable 1.x release of Julia
@@ -44,6 +68,7 @@ jobs:
       - uses: julia-actions/julia-runtest@latest
         env:
           JULIA_NUM_THREADS: 4
+          GROUP: ${{ matrix.group }}
       - uses: julia-actions/julia-processcoverage@v1
       - uses: codecov/codecov-action@v3
         with:
@@ -74,3 +99,4 @@ jobs:
       - uses: julia-actions/julia-runtest@latest
         env:
           JULIA_NUM_THREADS: 4
+          GROUP: 'tensors'