fix: reduce redundant work during chat and note startup

Avoid hidden activity renders, no-op message saves and attachment scans when pinning conversations. Reuse note body inspection and skip unchanged attachment reference writes while preserving recovery and cleanup behavior. Skip unnecessary Markdown normalization and memoize subagent lookups without delaying live rich text. Add storage operation counts and real Electron rendering equivalence benchmarks; full-render speedup remains unproven. Validation: 5397 tests passed, 84 skipped; typecheck passed. Lint passed excluding two existing untracked sidebar probe files. Release note: Reduce repeated rendering and disk work during chat, conversation pinning and note startup while preserving existing content and interactions.
2026-09-28 20:53:43 +08:00
parent 594222a2b5
commit 13ff182858
23 changed files with 1047 additions and 54 deletions
@@ -280,6 +280,44 @@
  Renderer 堆内存。
 - **验收：** 测试数据、运行步骤和原始结果可重复执行。

+#### 2026-09-28 Measurement Evidence (Partial)
+
+`npx vitest run tests/streaming-markdown.electron.test.ts` runs the real
+MarkdownRenderer in Electron 43.2.0 / Chromium 150.0.7871.129. It compares the
+original normalizer with fast paths that skip unchanged text, retaining live
+Markdown, math, code and HTML behavior. It also measures a 102,400-byte answer
+at six growing prefixes, alternating original/current execution order in the
+same page, with one warm-up sweep and three measured sweeps (18 samples each).
+
+| Measurement | Original | Current |
+| --- | --- | --- |
+| 100KiB growing-prefix render median, isolated run | 54.80 ms | 54.65 ms |
+| Same run p95 | 95.50 ms | 106.10 ms |
+| Growing-prefix render median, full-suite run | 53.50 ms | 53.10 ms |
+| Same run p95 | 93.70 ms | 83.40 ms |
+
+These development-mode measurements include synchronous React rendering, DOM
+commit and style/layout, but exclude frame waiting and paint. With 18 samples,
+nearest-rank p95 is the maximum sample. The results do not establish an overall
+rendering improvement. Smaller 6.4-7.2K-character corpora do show lower normalizer
+cost: prose median 33-34 microseconds to below 1 microsecond, and mixed math/code
+median 32-35 to 16-20 microseconds. The production changes remain limited to this
+preprocessing and memoizing unchanged subagent-derived collections. In the
+four-subagent regression, initial render plus six updates builds the lookup map
+once instead of seven times; block-dependent scans still run when blocks change.
+
+Validation: 550 prefix normalization comparisons, 1,100 short-prefix DOM
+comparisons and 24 long-prefix DOM comparisons passed. The real Electron
+terminal-status probe covers cancellation, failure, retry and persistence via
+three loopback model-stub requests; the Mermaid viewer covers nine scenarios
+and ten PNG downloads. No external model calls were used for these probes.
+Full `npm test` passed 459 files / 5,397 tests, with 11 files / 84 tests skipped.
+Type checking and scoped lint passed. Full lint remains blocked by the existing
+untracked sidebar-final probe files.
+
+This is partial evidence for PERF-03, not completion: full-App input latency,
+frame rate, heap measurements and 500KB/1MB scenarios remain unmeasured.
+
 ### PERF-04 流式更新合并

 - **优先级 / 状态：** P1 / 待开始