perf: virtual-core rewrite for mount/measure-storm, plus iOS Safari handling and scroll restoration#1168

Merged

tannerlinsley merged 43 commits into

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taren/brave-wing-8c454f

May 20, 2026

Commits on May 17, 2026

perf(virtual-core): replace Map clone in resizeItem with version counter
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perf(virtual-core): rewrite setOptions to avoid Object.entries+delete
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perf(virtual-core): track pending-rebuild min with a counter, not an array
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chore(virtual-core): add Layer 4 bench scenarios (resizeItem notify cost)
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perf(virtual-core): pre-size defaultRangeExtractor's result array
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fix(virtual-core): cast setOptions merged-defaults through unknown
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perf(react-virtual): use a number counter for useReducer instead of allocating {}
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fix(virtual-core): drop elementsCache entry when RO sees disconnected node
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perf(virtual-core): make memo's debug instrumentation tree-shakable
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refactor(virtual-core): collapse element/window observer pairs to one impl
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refactor(virtual-core): replace utils barrel with named exports
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chore(benchmarks): add reproducible cross-library benchmark suite
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docs: add competitor claims verification matrix
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exp(virtual-core): lazy VirtualItem materialization for lanes===1 fast path
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exp(virtual-core): defer scroll-position adjustments during iOS momentum scroll
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exp(virtual-core): keep smooth scroll while still > viewport from new target
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exp(virtual-core): skip scroll-position adjustment while user scrolls backward
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exp(virtual-core): add takeSnapshot() for scroll restoration round-trips
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exp(virtual-core): bypass lazy-view Proxy in calculateRange + getVirtualItemForOffset
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docs: summarize 3-hour experimentation loop results
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exp(virtual-core): getTotalSize reads last end directly from flat typed array
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docs: update experiments summary with final cross-library numbers
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fix(benchmarks): remove 1px border on .scroll-host so accuracy bench is fair
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test(benchmarks): add three accuracy edge cases for scrollToIndex
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docs: plan iOS Phase 1 + Phase 2 (touch distinction, subpixel reconciliation, elastic clamp)
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docs: add bundle-impact section to iOS support plan
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feat(virtual-core): iOS Phase 1 — touch event distinction for scroll deferral
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feat(virtual-core): iOS Phase 2a — subpixel reconciliation for scrollTop writes
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feat(virtual-core): iOS Phase 2b — skip flush during Safari elastic-overscroll
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Commits on May 20, 2026