kdletters
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优化图片画布拖动性能 (#173)
## 修改
- 按动画帧合并高频拖动更新，结束时持久化最终状态
- 对未移动图层子树做 memo，保留并发资源与业务字段更新
- 补充拖动合帧、最终 flush、并发状态和图层渲染回归
- 同步真实位图性能验收与排障文档
## 验证
- 8 个相关测试文件 202/202 通过
- TypeScript typecheck、编码检查、Prettier、git diff --check 通过
- 12000×12000 画布、360 张独立 512×512 PNG：有效位置更新 23.44/s → 58.18/s，gap p95 119.8ms → 32.9ms，>50ms 停顿 32 → 0，持久化快照 240 → 1
- 可信 CDP 输入最终运动观测约 46.9 FPS，不以空转 rAF 代替拖动帧率
Reviewed-on: #173
Co-authored-by: kdletters <kdletters@qq.com>
Co-committed-by: kdletters <kdletters@qq.com>
2026-08-21 15:33:02 +08:00
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