From 5813c8a32eae66442fada7f5678c0b8896b6391f Mon Sep 17 00:00:00 2001
From: vgoodric <vgoodric@adobe.com>
Date: Thu, 6 Jun 2024 23:58:01 -0600
Subject: [PATCH 1/2] calculate preview in utils

---
 libs/utils/utils.js | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/libs/utils/utils.js b/libs/utils/utils.js
index 8c2103ca49..6d3520885b 100644
--- a/libs/utils/utils.js
+++ b/libs/utils/utils.js
@@ -919,7 +919,7 @@ export const combineMepSources = async (persEnabled, promoEnabled, mepParam) =>
 };
 
 async function checkForPageMods() {
-  const { mep: mepParam } = Object.fromEntries(PAGE_URL.searchParams);
+  const { mep: mepParam, mepButton } = Object.fromEntries(PAGE_URL.searchParams);
   if (mepParam === 'off') return;
   const persEnabled = getMepEnablement('personalization');
   const promoEnabled = getMepEnablement('manifestnames', 'promo');
@@ -928,7 +928,11 @@ async function checkForPageMods() {
   if (!mepEnabled) return;
 
   const config = getConfig();
-  config.mep = { targetEnabled };
+  config.mep = {
+    targetEnabled,
+    preview: (mepButton !== 'off'
+      && (config.env?.name !== 'prod' || mepParam || mepParam === '' || mepButton)),
+  };
   loadLink(
     `${config.base}/features/personalization/personalization.js`,
     { as: 'script', rel: 'modulepreload' },

From 24eeb9aee29f1df6a5f047e34a77265d52963354 Mon Sep 17 00:00:00 2001
From: vgoodric <vgoodric@adobe.com>
Date: Thu, 6 Jun 2024 23:58:31 -0600
Subject: [PATCH 2/2] update personalization to not recalculate

---
 libs/features/personalization/personalization.js | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/libs/features/personalization/personalization.js b/libs/features/personalization/personalization.js
index 1473eb2bf0..d64c3204a1 100644
--- a/libs/features/personalization/personalization.js
+++ b/libs/features/personalization/personalization.js
@@ -826,12 +826,10 @@ export async function applyPers(manifests, postLCP = false) {
       const {
         mep: mepParam,
         mepHighlight,
-        mepButton,
       } = Object.fromEntries(PAGE_URL.searchParams);
       config.mep = {
         handleFragmentCommand,
-        preview: (mepButton !== 'off'
-          && (config.env?.name !== 'prod' || mepParam || mepParam === '' || mepButton)),
+        preview: config.mep?.preview,
         override: mepParam ? decodeURIComponent(mepParam) : '',
         highlight: (mepHighlight !== undefined && mepHighlight !== 'false'),
         mepParam,