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My Windows 11 Mini-PC holds its own with the monster-sized images fairly well (after disabling acceleration, excluding all of Sigil's binaries/folders from antivirus, and telling Windows to optimize performance for Sigil and QtWebEngineProcess), so I think I'm ready to put this test case to bed. If you want to use monster-sized avifs in your epubs on Windows, be prepared for some fairly sluggish Sigil performance regardless of your hardware.
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