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AVX2 is slower than SSE2-4.x under Windows ARM emulation

by David Millington blogs.remobjects.com published 2026-02-1712 min read

If you compile your app for AVX2 and it runs on Windows ARM under Prism emulation, is it faster or slower than compiling for SSE2-4.x? I assumed it would be roughly the same — maybe slightly slower due to emulation overhead, but AVX2's wider operations would compensate. The
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Systems & PerformanceSoftware Engineering2026

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Feb 18, 2026AVX2 is slower than SSE2-4.x under Windows ARM emulation by vintagedave11282

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