It can be substantially faster in some cases. Notepad++ (with several plugins) start up goes down from around ~1.03 sec to ~0.61 sec on my machine (with wineprefix active).
9b7669592d6f8b40976b571b70f8543777d35167 is what introduced this performance regression. I don't know why exactly, but it made my Notepad++ noticeably slower when launched from a file manager (so it's not just at wineprefix startup overhead), which is very annoying.
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v2: win32u: Cache is_virtual_desktop.
https://gitlab.winehq.org/wine/wine/-/merge_requests/5070
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v6: mfreadwrite/reader: Pass the device manager to the stream transforms.
winegstreamer/video_processor: Implement D3D awareness.
mf/tests: Test video processor D3D11 awareness.
mfreadwrite/tests: Add some source reader D3D11 awareness tests.
https://gitlab.winehq.org/wine/wine/-/merge_requests/5459