diff --git a/.github/workflows/Test.yml b/.github/workflows/Test.yml
index 591bb3e2d..724a037ae 100644
--- a/.github/workflows/Test.yml
+++ b/.github/workflows/Test.yml
@@ -7,6 +7,12 @@ on:
   pull_request:
   workflow_dispatch:
 
+concurrency:
+  # Skip intermediate builds: always.
+  # Cancel intermediate builds: always.
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
 jobs:
   test:
     name: Julia ${{ matrix.version }} - ${{ matrix.os }}
@@ -22,14 +28,28 @@ jobs:
         with:
           version: ${{ matrix.version }}
       - uses: julia-actions/cache@v2
+        timeout-minutes: 5
       - name: Develop subpackages
         run: |
           julia --project -e "
             using Pkg
             Pkg.develop([PackageSpec(; name=basename(path), path) for path in ARGS])
           " lib/GPUArraysCore lib/JLArrays
+      - name: "Set test arguments"
+        shell: bash
+        run: |
+          # Run tests in verbose mode
+          TEST_ARGS=(--verbose)
+          if [[ ${{ runner.os }} == "macOS" ]]; then
+              # Encourage ParallelTestRunner to use two jobs on macOS, rather
+              # than the single one it'd use by default.
+              TEST_ARGS+=(--jobs=2)
+          fi
+          echo "runtest_test_args=${TEST_ARGS[@]}" >> "${GITHUB_ENV}"
       - uses: julia-actions/julia-runtest@v1
         continue-on-error: ${{ matrix.version == 'nightly' }}
+        with:
+          test_args: ${{ env.runtest_test_args }}
       - uses: julia-actions/julia-processcoverage@v1
         with:
           directories: src,lib