Vitest 5.0 lands with up to 53% faster vm pools and new Trace View
cnakazawa · x · 2026-09-04
Vitest 5.0 is out, with performance as the headline focus.
- vm pools up to 53% faster; 18% improvement overall including Browser Mode
- New built-in Trace View in Browser Mode, plus nested projects support
- New benchmarking API, new vi.when API, and better defaults
- Benchmarks run on generated reference apps from a 5-file package up to a 1,280-module enterprise monolith, not micro-benchmarks
- Migration guide available; the project counts 790+ contributors
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