[autocomplete] Optimize selected option lookup#47953
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…ocomplete Use a Set-based fast path when isOptionEqualToValue is the default strict equality comparator. This avoids quadratic selected-state checks in large multiple selections while preserving custom equality semantics. Also add a regression test to ensure custom isOptionEqualToValue behavior is unchanged.
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Co-authored-by: Albert Yu <albert@albertyu.co> Signed-off-by: an.chmelev <an.chmelev@gmail.com>
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Signed-off-by: an.chmelev <an.chmelev@gmail.com> Signed-off-by: Albert Yu <albert@albertyu.co> Co-authored-by: Andrei Chmelev <chmelev.andrey@rwb.ru> Co-authored-by: Albert Yu <albert@albertyu.co>
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Closes #47843
Summary
This PR improves
Autocompleteperformance inmultiplemode with large datasets by optimizing selected-option lookups inuseAutocomplete.Problem
When many options are selected (for example, 10,000), selected-state checks are done repeatedly with linear scans (
Array.some) in hot paths:filterSelectedOptionsaria-selectedviagetOptionProps)That leads to quadratic work and visible lag.
What changed
Setof selected values once per render whenisOptionEqualToValueis the default (option === value)Set.has(option)for O(1) lookupisOptionEqualToValueis customized, keep usingsome(...)to preserve user-defined semanticsisOptionSelectedhelper in both hot paths:filterSelectedOptionsgetOptionProps(aria-selected)isOptionEqualToValuebehavior is unchanged.Why this approach
Set.hasis only correct for strict reference equality.For custom comparators (for example, compare by
id),Set.hascan be incorrect, so this PR explicitly falls back to comparator-based scans in that case.This gives a large perf win for the default path without changing behavior for customized equality.
Benchmark notes
Local micro-benchmark (10,000 options, 10,000 selected, two selected-state passes):
Tests
pnpm prettierpnpm eslint packages/mui-material/src/useAutocomplete/useAutocomplete.js packages/mui-material/src/useAutocomplete/useAutocomplete.test.jspnpm test:node useAutocomplete