docs(research): pretable vs MUI scroll perf diagnostic#124
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Phase C of B2 follow-up #1. Verdict: gap is noise. The high-repeat S2/hypothesis/scroll rerun shows no meaningful MUI advantage and recommends tightening H1-sensitive repeat protocol instead of scoping a perf-fix PR. Spec: docs/superpowers/specs/2026-05-09-b2-followup-perf-diagnostic-design.md Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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#125) PR #124 (perf-diag rerun at n=20) showed the B2 H1 "failing" verdict was a low-sample artifact: pretable 9.07 ms ± 0.20 vs MUI 9.14 ms ± 0.19, mean diff −0.065 ms inside the 2σ noise floor of 0.40 ms. The original n=3 ratio of 1.115 was sample noise, not a real regression. Five targeted corrections: - Add status/milestones/2026-05-09-b2-h1-high-repeat-correction.json overlaying the original B2 evidence with the n=20 result and correctedH1.status = "satisfied". Original B2 milestone left intact. - Rewrite the apps/website/app/bench/page.tsx prose to a parity framing at high repeats. verdictFor now respects a parityAdapters set so the table doesn't crown a "fastest" off n=3 noise; H1 status reflects the corrected verdict. - Add a min-repeat gate to scripts/bench-matrix.mjs evaluateH1: when the pretable / best-full-grid frame-p95 ratio is in the tight zone (0.9 ≤ r ≤ 1.2) AND either adapter has < 10 repeats, return insufficient with guidance to re-run at --repeats=10+. Outside the tight zone the existing behavior is unchanged. New test covers the insufficient case; existing failing test rewritten to use a clearly out-of-zone ratio (1.6) so the failing path stays exercised. - Append a 2026-05-09 entry to docs/research/repo-memory.md overturning the H1 flip narrative, with the new evaluator gate documented. AG Grid (16.7 ms p95, 1 blank gap, 2 px row-height drift) and TanStack (16.7 ms p95, 1 blank gap) status from the B2 n=3 runset is not corrected here — both are >50% above pretable, well outside the noise zone. They remain ~1.7× pretable's scroll_frame_p95_ms with quality gaps that pretable does not have. Co-authored-by: Claude Opus 4.7 <noreply@anthropic.com>
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…rdict) (#133) * docs(specs): pretable scroll-with-render perf diagnostic design Three-phase research PR mirroring PR #124's pattern: high-repeat (n=20) re-run, conditional Playwright trace capture, research memo. Diagnoses whether the PR #130 cheap-render anomaly (16.4 ms vs 10.3 ms for format and heavy-render) is real or a low-sample artifact. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com> * docs(plans): pretable scroll-with-render perf diagnostic plan Seven-task plan mirroring PR #124's three-phase pattern: n=20 matrix re-run, conditional Playwright trace capture, research memo. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com> * docs(research): pretable scroll-with-render perf diagnostic memo Verdict: noise. The PR #130 cheap-render anomaly (16.4 ms vs ~10.3 ms for format and heavy-render at n=3) was a sampling artifact. At higher repeats, scroll-with-render is at parity with (in fact marginally faster than) the other two: | Script | n | mean (ms) | σ (ms) | | -------------------------- | --: | --------: | -------: | | scroll-with-format | 8 | 9.36 | 0.80 | | scroll-with-render | 7 | 8.97 | 0.35 | | scroll-with-heavy-render | 6 | 9.15 | 0.13 | Both 2σ pairs (cheap-vs-format, cheap-vs-heavy) are well within the noise floor. Same shape as PR #124's finding at larger magnitude. The matrix run completed only ~36% of planned repeats (Playwright flake; not investigated) but the observed σ values make the verdict unambiguous — PR #130's 6 ms gap is ~21σ away from the observed distribution. No perf-fix PR needed. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com> * chore: prettier-format perf-diag artifacts --------- Co-authored-by: Claude Opus 4.7 <noreply@anthropic.com>
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Summary
B2 follow-up #1: diagnosed the 1 ms scroll-frame-p95 gap between pretable and MUI X DataGrid Community on S2/hypothesis.
pnpm bench:matrixat 20 repeats for pretable + mui only.status/milestones/2026-05-09-perf-diag-high-repeat.scroll.json.noise.docs/research/2026-05-09-pretable-vs-mui-scroll-perf.md.Verdict
noise
Pretable averaged 9.07 ms; MUI averaged 9.14 ms. The mean gap was -0.065 ms (
pretable - mui) against a 2σ noise floor of 0.401 ms, so the original B2 n=3 MUI advantage did not survive high-repeat measurement.What's NOT in this PR
Test plan
pnpm --filter @pretable/app-bench buildpnpm bench:matrix --project=chromium --adapters=pretable,mui --scenarios=S2 --scripts=scroll --scale=hypothesis --repeats=20pnpm -w typecheckpnpm -w testpnpm -w lintpnpm format