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I ran windows-10-for-arm within UTM on the Mac. This was back in August and at that time ar least I had some misery with networking in the Windows world. Native ARM code runs with very little slowdown under Windows/UTM but what astonished me was that my own code running under cygwin-x86_64 in that world was maybe only a factor of 3 down on the same code native built on the Mac. So a slowdown but the Mac m1 is sufficiently fast that that is not really a crawl. I have not tried more recently and am concerned with rumours that Microsoft may withdraw x86_64 emulation from W10 (but keep it in W11), and with concerns about windows-for-arm licenses for use in a virtual environment. Arthur