Add reorder1k benchmark#17
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Measures moving the first 3 of 1,000 keyed rows to the end of the list (3 warmup runs plus a measured run). This displacement pattern is the worst case for reconciliation heuristics that only handle shifts: the whole suffix gets moved instead of the short displaced prefix. Adds a displace(n) mutation to the shared store and exposes it from the preact, preact-class, and preact-hooks table-app implementations.
This was referenced Jul 22, 2026
The lockfile pins whatever chromedriver major was current when it was last refreshed (131 right now), while the CI runner image ships a newer Chrome (150). detect_chromedriver_version makes the chromedriver package download the driver matching the installed browser, so the two can no longer drift apart.
marvinhagemeister
approved these changes
Jul 23, 2026
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What
Adds a
reorder1kbenchmark to the table-app suite: it renders 1,000 keyed rows, then measures moving the first 3 rows to the end of the list (3 warmup runs + 1 measured run, asserting row order between runs).Why
This displacement pattern is a worst case for reconciliation heuristics that only recognize shift patterns: instead of moving the 3 displaced rows, the reconciler moves the entire 997-row suffix. None of the existing benchmarks exercise it —
swapRowsis excluded from the pathological path by design, andmany-updates/update10th1kdon't reorder at all.It directly motivates preactjs/preact#5172 and the v11 minimal-moves work; current numbers on v10.x (Chrome 150, headless, tachometer):
How
store.displace(n)added to the shared table-app storedisplacefrom thepreact,preact-class, andpreact-hooksimplementations (preact-signalsis currently a counter stub, so it was left alone)apps/table-app/reorder1k.htmlmodeled afterupdate10th1k.html