Perf/improve findidxinold func

README.md

@@ -18,7 +18,7 @@ You are looking at the repository for Vue 2. The repo for Vue 3 is [vuejs/core](
 Vue.js is an MIT-licensed open source project with its ongoing development made possible entirely by the support of these awesome [backers](https://github.com/vuejs/core/blob/main/BACKERS.md). If you'd like to join them, please consider [ sponsor Vue's development](https://vuejs.org/sponsor/).
 
 <p align="center">
-  <a target="_blank" href="https://vuejs.org/sponsor/">
+  <a target="_blank" href="https://vuejs.org/sponsor/#current-sponsors">
     <img alt="sponsors" src="https://sponsors.vuejs.org/sponsors.svg">
   </a>
 </p>

src/core/vdom/patch.js

@@ -492,7 +492,7 @@ export function createPatchFunction (backend) {
   }
 
   function findIdxInOld (node, oldCh, start, end) {
-    for (let i = start; i < end; i++) {
+    for (let i = start + 1; i < end; i++) {
       const c = oldCh[i]
       if (isDef(c) && sameVnode(node, c)) return i
     }