diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 26a4c7af..2041cb55 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -405,8 +405,12 @@ jobs:
             summary.push([compiler, pre(ms.format(min)), pre(ms.format(avg)), pre(ms.format(max)), pre(dec.format(stddev)), pre(`${dec.format(avg / fastest)}x`)].join(" | "));
             const key = 'duration-' + compiler;
             const value = avg;
+            const slowdownKey = compiler + '-slowdown';
+            const slowdownValue = dec.format(avg / fastest);
 
             fs.appendFileSync(outputFilePath, `${key}=${value}
+          `)
+            fs.appendFileSync(outputFilePath, `${slowdownKey}=${slowdownValue}
           `)
           }
           summary.push("");
@@ -414,6 +418,7 @@ jobs:
           fs.appendFileSync(process.env.GITHUB_STEP_SUMMARY, summary.join("\n"), "utf-8");
           EOF
       - name: Authenticate Via OIDC Role
+        if: github.ref == 'refs/heads/main'
         uses: aws-actions/configure-aws-credentials@v4
         with:
           aws-region: us-east-1
@@ -422,6 +427,8 @@ jobs:
           role-session-name: github-diff-action@cdk-ops
           output-credentials: true
       - name: Publish Metrics
+        if: github.ref == 'refs/heads/main'
         run: |-
           aws cloudwatch put-metric-data --metric-name TSC-average --namespace JsiiPerformance --value ${{ steps.output_summary.outputs.duration-tsc }}
           aws cloudwatch put-metric-data --metric-name JSII-average --namespace JsiiPerformance --value ${{ steps.output_summary.outputs.duration-jsii }}
+          aws cloudwatch put-metric-data --metric-name JSII-slowdown --namespace JsiiPerformance --value ${{ steps.output_summary.outputs.jsii-slowdown }}
diff --git a/projenrc/benchmark-test.ts b/projenrc/benchmark-test.ts
index c1e08c40..4cf0260e 100644
--- a/projenrc/benchmark-test.ts
+++ b/projenrc/benchmark-test.ts
@@ -118,8 +118,11 @@ export class BenchmarkTest {
               '  summary.push([compiler, pre(ms.format(min)), pre(ms.format(avg)), pre(ms.format(max)), pre(dec.format(stddev)), pre(`${dec.format(avg / fastest)}x`)].join(" | "));',
               `  const key = 'duration-' + compiler;`,
               `  const value = avg;`,
+              `  const slowdownKey = compiler + '-slowdown';`,
+              `  const slowdownValue = dec.format(avg / fastest);`,
               '',
               '  fs.appendFileSync(outputFilePath, `${key}=${value}\n`)',
+              '  fs.appendFileSync(outputFilePath, `${slowdownKey}=${slowdownValue}\n`)',
               '}',
               'summary.push("");',
               '',
@@ -129,6 +132,7 @@ export class BenchmarkTest {
           },
           {
             name: 'Authenticate Via OIDC Role',
+            if: `github.ref == 'refs/heads/main'`,
             uses: 'aws-actions/configure-aws-credentials@v4',
             with: {
               'aws-region': 'us-east-1',
@@ -140,9 +144,11 @@ export class BenchmarkTest {
           },
           {
             name: 'Publish Metrics',
+            if: `github.ref == 'refs/heads/main'`,
             run: [
               'aws cloudwatch put-metric-data --metric-name TSC-average --namespace JsiiPerformance --value ${{ steps.output_summary.outputs.duration-tsc }}',
               'aws cloudwatch put-metric-data --metric-name JSII-average --namespace JsiiPerformance --value ${{ steps.output_summary.outputs.duration-jsii }}',
+              'aws cloudwatch put-metric-data --metric-name JSII-slowdown --namespace JsiiPerformance --value ${{ steps.output_summary.outputs.jsii-slowdown }}',
             ].join('\n'),
           },
         ],