diff --git a/scripts/aem.js b/scripts/aem.js
index 99f56f5442..6e92dd7ed5 100644
--- a/scripts/aem.js
+++ b/scripts/aem.js
@@ -1,5 +1,5 @@
 /*
- * Copyright 2023 Adobe. All rights reserved.
+ * Copyright 2024 Adobe. All rights reserved.
  * This file is licensed to you under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License. You may obtain a copy
  * of the License at http://www.apache.org/licenses/LICENSE-2.0
@@ -22,6 +22,9 @@
  * for instance the href of a link, or a search term
  */
 function sampleRUM(checkpoint, data = {}) {
+  const SESSION_STORAGE_KEY = 'aem-rum';
+  sampleRUM.baseURL = sampleRUM.baseURL
+    || new URL(window.RUM_BASE == null ? 'https://rum.hlx.page' : window.RUM_BASE, window.location);
   sampleRUM.defer = sampleRUM.defer || [];
   const defer = (fnname) => {
     sampleRUM[fnname] = sampleRUM[fnname] || ((...args) => sampleRUM.defer.push({ fnname, args }));
@@ -53,12 +56,21 @@ function sampleRUM(checkpoint, data = {}) {
         .join('');
       const random = Math.random();
       const isSelected = random * weight < 1;
-      const firstReadTime = Date.now();
+      const firstReadTime = window.performance ? window.performance.timeOrigin : Date.now();
       const urlSanitizers = {
         full: () => window.location.href,
         origin: () => window.location.origin,
         path: () => window.location.href.replace(/\?.*$/, ''),
       };
+      // eslint-disable-next-line max-len
+      const rumSessionStorage = sessionStorage.getItem(SESSION_STORAGE_KEY)
+        ? JSON.parse(sessionStorage.getItem(SESSION_STORAGE_KEY))
+        : {};
+      // eslint-disable-next-line max-len
+      rumSessionStorage.pages = (rumSessionStorage.pages ? rumSessionStorage.pages : 0)
+        + 1
+        /* noise */ + (Math.floor(Math.random() * 20) - 10);
+      sessionStorage.setItem(SESSION_STORAGE_KEY, JSON.stringify(rumSessionStorage));
       // eslint-disable-next-line object-curly-newline, max-len
       window.hlx.rum = {
         weight,
@@ -68,8 +80,10 @@ function sampleRUM(checkpoint, data = {}) {
         firstReadTime,
         sampleRUM,
         sanitizeURL: urlSanitizers[window.hlx.RUM_MASK_URL || 'path'],
+        rumSessionStorage,
       };
     }
+
     const { weight, id, firstReadTime } = window.hlx.rum;
     if (window.hlx && window.hlx.rum && window.hlx.rum.isSelected) {
       const knownProperties = [
@@ -85,32 +99,35 @@ function sampleRUM(checkpoint, data = {}) {
         'FID',
         'LCP',
         'INP',
+        'TTFB',
       ];
       const sendPing = (pdata = data) => {
+        // eslint-disable-next-line max-len
+        const t = Math.round(
+          window.performance ? window.performance.now() : Date.now() - firstReadTime,
+        );
         // eslint-disable-next-line object-curly-newline, max-len, no-use-before-define
         const body = JSON.stringify(
           {
-            weight,
-            id,
-            referer: window.hlx.rum.sanitizeURL(),
-            checkpoint,
-            t: Date.now() - firstReadTime,
-            ...data,
+            weight, id, referer: window.hlx.rum.sanitizeURL(), checkpoint, t, ...data,
           },
           knownProperties,
         );
-        const url = `https://rum.hlx.page/.rum/${weight}`;
-        // eslint-disable-next-line no-unused-expressions
+        const url = new URL(`.rum/${weight}`, sampleRUM.baseURL).href;
         navigator.sendBeacon(url, body);
         // eslint-disable-next-line no-console
         console.debug(`ping:${checkpoint}`, pdata);
       };
       sampleRUM.cases = sampleRUM.cases || {
+        load: () => sampleRUM('pagesviewed', { source: window.hlx.rum.rumSessionStorage.pages }) || true,
         cwv: () => sampleRUM.cwv(data) || true,
         lazy: () => {
           // use classic script to avoid CORS issues
           const script = document.createElement('script');
-          script.src = 'https://rum.hlx.page/.rum/@adobe/helix-rum-enhancer@^1/src/index.js';
+          script.src = new URL(
+            '.rum/@adobe/helix-rum-enhancer@^1/src/index.js',
+            sampleRUM.baseURL,
+          ).href;
           document.head.appendChild(script);
           return true;
         },