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At Preact we love real-browser testing, our whole test suite ran in karma for the last few years. Recently we switched over to @vitest.dev and we absolutely love it, we love it so much that we published vitest-browser-preact. It's a library that contains tools to test Preact in vitest browser mode.

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Not sure why windows is that much slower. Quite some time is spent initiating all fancy locators and parallel is a bit funky in vbm vs karma (stopped passing tests in vbm)