I think you've made a mistake in how you compute the speedups. If previously it took 105ms and now it takes 50ms, that's ~100% faster, not 48%.
(It's twice as fast)
Oxlint is just for linting. Biome does formatting and linting together in one tool, and supports other languages like CSS too. Oxc (of which oxlint is a part) is a whole JS toolchain which includes a parser, transformer, linter, minifier, formatter, and more.
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I think you've made a mistake in how you compute the speedups. If previously it took 105ms and now it takes 50ms, that's ~100% faster, not 48%.
(It's twice as fast)