diff --git a/.github/workflows/deploy-documentation.yml b/.github/workflows/deploy-documentation.yml
index 7ea7122909..f362e2dcc9 100644
--- a/.github/workflows/deploy-documentation.yml
+++ b/.github/workflows/deploy-documentation.yml
@@ -5,6 +5,10 @@ on:
     branches:
       - master
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
 permissions:
   contents: write
 
diff --git a/.github/workflows/unit-tests.yml b/.github/workflows/unit-tests.yml
index 7a510165e5..a82cb1cdd5 100644
--- a/.github/workflows/unit-tests.yml
+++ b/.github/workflows/unit-tests.yml
@@ -2,6 +2,10 @@ name: Unit tests
 
 on: pull_request
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
 jobs:
   full_test_run:
 
@@ -18,6 +22,15 @@ jobs:
     - name: NPM install
       run: npm ci
 
+    - name: Cache Playwright browsers
+      uses: actions/cache@v4
+      id: playwright-cache
+      with:
+        path: ~/.cache/ms-playwright
+        key: ${{ runner.os }}-playwright-${{ hashFiles('package-lock.json') }}
+        restore-keys: |
+          ${{ runner.os }}-playwright-
+
     - name: Install playwright browsers
       run: npx playwright install --with-deps