diff --git a/scripts/lib-franklin-performance.js b/scripts/lib-franklin-performance.js
new file mode 100644
index 00000000..4df4844d
--- /dev/null
+++ b/scripts/lib-franklin-performance.js
@@ -0,0 +1,109 @@
+/*
+ * lighthouse performance instrumentation helper
+ * (needs a refactor)
+ */
+
+function stamp(message, time = new Date() - performance.timing.navigationStart, type = '') {
+  // eslint-disable-next-line no-console
+  const colors = {
+    general: '#888',
+    cls: '#c50',
+    lcp: 'green',
+    tbt: 'red',
+    inp: '#a6c',
+    paint: '#b73',
+    franklin: '#586AE8',
+  };
+  const color = colors[type] || '#888';
+  // eslint-disable-next-line no-console
+  console.log(
+    `%c${Math.round(time).toString().padStart(5, ' ')}%c %c${type}%c ${message}`,
+    'background-color: #444; padding: 3px; border-radius: 3px;',
+    '',
+    `background-color: ${color}; padding: 3px 5px; border-radius: 3px;`,
+    '',
+  );
+}
+
+function registerPerformanceLogger() {
+  try {
+    const polcp = new PerformanceObserver((entryList) => {
+      const entries = entryList.getEntries();
+      entries.forEach((entry) => {
+        stamp(JSON.stringify(entry), entry.startTime, 'lcp');
+        // eslint-disable-next-line no-console
+        console.log(entry.element);
+      });
+    });
+    polcp.observe({ type: 'largest-contentful-paint', buffered: true });
+
+    const pols = new PerformanceObserver((entryList) => {
+      const entries = entryList.getEntries();
+      entries.forEach((entry) => {
+        const to = entry.sources[0].currentRect;
+        const from = entry.sources[0].previousRect;
+        stamp(`${Math.round(entry.value * 100000) / 100000}
+        from: ${from.top} ${from.right} ${from.bottom} ${from.left}
+        to:   ${to.top} ${to.right} ${to.bottom} ${to.left}`, entry.startTime, 'cls');
+        // eslint-disable-next-line no-console
+        console.log(entry.sources[0].node);
+      });
+    });
+    pols.observe({ type: 'layout-shift', buffered: true });
+
+    const polt = new PerformanceObserver((list) => {
+      list.getEntries().forEach((entry) => {
+        // Log the entry and all associated details.
+        stamp(JSON.stringify(entry), entry.startTime, 'tbt');
+      });
+    });
+
+    // Start listening for `longtask` entries to be dispatched.
+    polt.observe({ type: 'longtask', buffered: true });
+
+    const popaint = new PerformanceObserver((list) => {
+      list.getEntries().forEach((entry) => {
+        // Log the entry and all associated details.
+        stamp(JSON.stringify(entry), entry.startTime, 'paint');
+      });
+    });
+    // Start listening for `longtask` entries to be dispatched.
+    popaint.observe({ type: 'paint', buffered: true });
+
+    const pores = new PerformanceObserver((entryList) => {
+      const entries = entryList.getEntries();
+      entries.forEach((entry) => {
+        stamp(`${entry.name} loaded`, Math.round(entry.startTime + entry.duration));
+      });
+    });
+    pores.observe({ type: 'resource', buffered: true });
+
+    const poevt = new PerformanceObserver((list) => {
+      list.getEntries().forEach((entry) => {
+        // Log the entry and all associated details.
+        stamp(`${entry.name}: ${entry.duration}ms`, entry.startTime, 'inp');
+      });
+    });
+    // Start listening for `inp` entries to be dispatched.
+    poevt.observe({ type: 'event', buffered: true, durationThreshold: 1 });
+
+    document.body.addEventListener('section-display', (e) => {
+      stamp(`section displayed (${e.detail.sectionIndex + 1}/${e.detail.numSections})`, new Date() - performance.timing.navigationStart, 'franklin');
+      // eslint-disable-next-line no-console
+      console.log(e.detail.section);
+    });
+
+    document.body.addEventListener('block-loaded', (e) => {
+      stamp(`block loaded (${e.detail.blockName})`, new Date() - performance.timing.navigationStart, 'franklin');
+      // eslint-disable-next-line no-console
+      console.log(e.detail.block);
+    });
+  } catch (e) {
+    // no output
+  }
+}
+
+export default function performanceLogger() {
+  stamp('helix performance logging started');
+  registerPerformanceLogger();
+}
diff --git a/scripts/scripts.js b/scripts/scripts.js
index 32ad1e72..6a2bd325 100644
--- a/scripts/scripts.js
+++ b/scripts/scripts.js
@@ -1112,3 +1112,11 @@ try {
     },
   });
 } catch (e) { /* ignore */ }
+
+const params = new URLSearchParams(window.location.search);
+if (params.get('performance')) {
+  window.hlx.performance = true;
+  import('./lib-franklin-performance.js').then((mod) => {
+    if (mod.default) mod.default();
+  });
+}