I did something similar a while ago by explicitly adding a call to disable all theming in an app. That way you can even make the window decorations look like ol

I did something similar a while ago by explicitly adding a call to disable all theming in an app. That way you can even make the window decorations look like old Win9x borders in Windows 10. Disabling theming makes window creation measurably faster, by a lot. That includes lack of animations for that specific app, of course.