vSync is disabled on launching DLangIDE
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dollhaus commented
I suspect this is a LibSDL2 thing. When I launch DLangIDE, vsync is disabled, which instantly causes my GPU to go into "oh shit pump out ALL the frames" mode. Unlike the compositor, there are no window rules for this in KWin, and although I could use __GL_SYNC_TO_VBLANK=1, this might not be a solution for everyone.