Dont most games give you the option for framerate caps via vsync? I dont play a terrible number of games myself. Unsure if the power benefits scale with this tyoe of vsync.
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Terrible response times. Disappointing it took a class action threat to do something about it.
During Discovery well find out how big of an issue it actually is I guess.
You are correct, those options are available with Windows PC / DirectX. The move into mobile, whether it's Windows, Android, or iOS, sacrifices the driver capabilities of your graphics card in favor of a consistent OS performance. Also, probably because the GPU is integrated into the logic board.
I don't know a lot about GPUs or writing games, but the features available for DirectX are not present on macOS unless the developer explicitly writes code to expose those features.