cnfast vs cn(): Is the 7x Speedup Real in React?
SMRTR summary
cnfast promises a 3.8x–7x faster drop-in replacement for the cn() utility in shadcn/ui projects. Benchmarks confirm impressive isolated gains — up to 5.75x in Node, 2.12x in Chrome — but real-app testing across a 500-row data grid and virtual list shows negligible impact. cn() simply isn't the bottleneck in React renders; reconciliation and DOM work dominate.
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