From: Evan You <yyx990803@gmail.com>
Date: Sun, 28 Oct 2018 19:58:59 +0000 (-0400)
Subject: perf: skip props update if data object is the same
X-Git-Tag: v3.0.0-alpha.0~1068
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=d8cda2387f716fb7eb90dd50b65e6acac11484ff;p=thirdparty%2Fvuejs%2Fcore.git

perf: skip props update if data object is the same
---

diff --git a/packages/runtime-core/src/createRenderer.ts b/packages/runtime-core/src/createRenderer.ts
index 354450d959..e16424f656 100644
--- a/packages/runtime-core/src/createRenderer.ts
+++ b/packages/runtime-core/src/createRenderer.ts
@@ -468,7 +468,7 @@ export function createRenderer(options: RendererOptions) {
   }
 
   function patchStatefulComponent(prevVNode: MountedVNode, nextVNode: VNode) {
-    const { childFlags: prevChildFlags } = prevVNode
+    const { data: prevData, childFlags: prevChildFlags } = prevVNode
     const {
       data: nextData,
       slots: nextSlots,
@@ -481,7 +481,9 @@ export function createRenderer(options: RendererOptions) {
     instance.$parentVNode = nextVNode as MountedVNode
 
     // Update props. This will trigger child update if necessary.
-    updateProps(instance, nextData)
+    if (nextData !== prevData) {
+      updateProps(instance, nextData)
+    }
 
     // If has different slots content, or has non-compiled slots,
     // the child needs to be force updated. It's ok to call $forceUpdate