From b363fee510a048b010480ca7941126b8613fa6df Mon Sep 17 00:00:00 2001
From: fangliquan <fangliquan@qq.com>
Date: Mon, 17 Aug 2026 02:59:08 +0800
Subject: [PATCH] perf(tui): skip cached rounding subtrees before descent

---
 .../src/native-ts/yoga-layout/index.ts           | 16 +++++++++-------
 .../native-ts/yoga-layout/round-layout.test.ts   |  2 +-
 2 files changed, 10 insertions(+), 8 deletions(-)

diff --git a/ui-tui/packages/hermes-ink/src/native-ts/yoga-layout/index.ts b/ui-tui/packages/hermes-ink/src/native-ts/yoga-layout/index.ts
index 5e954e9903..2333931237 100644
--- a/ui-tui/packages/hermes-ink/src/native-ts/yoga-layout/index.ts
+++ b/ui-tui/packages/hermes-ink/src/native-ts/yoga-layout/index.ts
@@ -979,13 +979,6 @@ function layoutNode(
 
   if (performLayout) {
     node._rLayoutGen = _generation
-
-    let ancestor: Node | null = node
-
-    while (ancestor && ancestor._rSubtreeLayoutGen !== _generation) {
-      ancestor._rSubtreeLayoutGen = _generation
-      ancestor = ancestor.parent
-    }
   }
 
   const style = node.style
@@ -1056,6 +1049,15 @@ function layoutNode(
     }
   }
 
+  if (performLayout) {
+    let ancestor: Node | null = node
+
+    while (ancestor && ancestor._rSubtreeLayoutGen !== _generation) {
+      ancestor._rSubtreeLayoutGen = _generation
+      ancestor = ancestor.parent
+    }
+  }
+
   const wasDirty = node.isDirty_
 
   if (performLayout) {
diff --git a/ui-tui/packages/hermes-ink/src/native-ts/yoga-layout/round-layout.test.ts b/ui-tui/packages/hermes-ink/src/native-ts/yoga-layout/round-layout.test.ts
index f49d787967..12f7b35927 100644
--- a/ui-tui/packages/hermes-ink/src/native-ts/yoga-layout/round-layout.test.ts
+++ b/ui-tui/packages/hermes-ink/src/native-ts/yoga-layout/round-layout.test.ts
@@ -74,7 +74,7 @@ describe('incremental layout rounding', () => {
     expect(clock.getComputedWidth()).toBe(6.5)
     expect(transcript.getComputedWidth()).toBe(transcriptWidth)
     expect(counters.rounded).toBeLessThanOrEqual(4)
-    expect(counters.roundSkips).toBeGreaterThanOrEqual(1)
+    expect(counters.roundSkips).toBe(1)
 
     root.freeRecursive()
     Yoga.Config.destroy(config)