diff --git a/.github/workflows/benchmarks.yml b/.github/workflows/benchmarks.yml
new file mode 100644
index 00000000000..33d2697271a
--- /dev/null
+++ b/.github/workflows/benchmarks.yml
@@ -0,0 +1,74 @@
+name: Performance benchmarks
+
+on:
+  pull_request_target:
+    types: [opened, ready_for_review]
+    branches:
+      - main
+  issue_comment:
+    types: [created]
+
+permissions:
+  issues: write
+  pull-requests: write
+
+jobs:
+  run-benchmarks:
+    if: >
+      github.event_name == 'pull_request_target' || 
+      (github.event_name == 'issue_comment' && contains(github.event.comment.body, '/rerun-benchmarks'))
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout main branch
+        uses: actions/checkout@v4
+        with:
+          ref: main
+          repository: EwoutH/mesa
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: '3.12'
+      - name: Add project directory to PYTHONPATH
+        run: echo "PYTHONPATH=$PYTHONPATH:$(pwd)" >> $GITHUB_ENV
+      - name: Install dependencies
+        run: pip install numpy pandas tqdm tabulate
+      - name: Run benchmarks on main branch
+        working-directory: benchmarks
+        run: python global_benchmark.py
+      - name: Upload benchmark results
+        uses: actions/upload-artifact@v4
+        with:
+          name: timings-main
+          path: benchmarks/timings_1.pickle
+      - name: Checkout PR branch
+        uses: actions/checkout@v4
+        with:
+          ref: refs/pull/${{ github.event.pull_request.number }}/merge
+          repository: ${{ github.event.pull_request.head.repo.full_name }}
+          token: ${{ secrets.GITHUB_TOKEN }}
+          clean: false
+      - name: Download benchmark results
+        uses: actions/download-artifact@v4
+        with:
+          name: timings-main
+          path: benchmarks
+      - name: Run benchmarks on PR branch
+        working-directory: benchmarks
+        run: python global_benchmark.py
+      - name: Run compare timings and encode output
+        working-directory: benchmarks
+        run: |
+          TIMING_COMPARISON=$(python compare_timings.py | base64 -w 0)  # Base64 encode the output
+          echo "TIMING_COMPARISON=$TIMING_COMPARISON" >> $GITHUB_ENV
+      - name: Comment PR
+        uses: actions/github-script@v7
+        with:
+          script: |
+            const output = Buffer.from(process.env.TIMING_COMPARISON, 'base64').toString('utf-8');
+            const issue_number = context.issue.number;
+            github.rest.issues.createComment({
+              issue_number: issue_number,
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              body: 'Benchmark Comparison:\n\n' + output
+            });
diff --git a/benchmarks/global_benchmark.py b/benchmarks/global_benchmark.py
index 9547d94a674..f1cf938eab0 100644
--- a/benchmarks/global_benchmark.py
+++ b/benchmarks/global_benchmark.py
@@ -12,13 +12,13 @@
 def run_model(model_class, seed, parameters):
     start_init = timeit.default_timer()
     model = model_class(seed=seed, **parameters)
-    #   time.sleep(0.001)
+    time.sleep(0.001)
 
     end_init_start_run = timeit.default_timer()
 
     for _ in range(config["steps"]):
         model.step()
-    #       time.sleep(0.0001)
+        time.sleep(0.0001)
     end_run = timeit.default_timer()
 
     return (end_init_start_run - start_init), (end_run - end_init_start_run)