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For what it may be worth, on my Windows 11 machine with an Nvidia T1000 8GB video card, when I have GPU acceleration enabled, I do see the increase in memory usage when repeatedly closing and opening Sigil's Preview window. With GPU acceleration turned off, Sigil still seems to use 44MB of dedicated GPU memory. Opening the preview window jumps that to 48MB temporarily after which I see the memory use jumping between 0 and 44MB before settling back to 44MB. OTOH, I do not see a noticeable difference in screen draw speed whether or not I have GPU acceleration enabled.
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