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Now (only in the generic backend, where it is implemented), this hint is always respected. Previously it would only be used if no windows were created, to help reduce CPU load on things like loopwave. Since it's always used now, the default has changed from 60 (Hz) to 0 (run as fast as possible). Things like loopwave should still likely force this way lower than the previous default (and already do: loopwave explicitly sets it to 5). The hint can now also be set to "waitevent" which will cause SDL_AppIterate to only be called after new events have arrived, for apps that are entirely driven by input and want to consume (almost) no power or CPU time until then. Fixes #11093. Fixes #11387.
Simple DirectMedia Layer (SDL) Version 3.0
Simple DirectMedia Layer is a cross-platform development library designed to provide low level access to audio, keyboard, mouse, joystick, and graphics hardware. It is used by video playback software, emulators, and popular games including Valve's award winning catalog and many Humble Bundle games.
More extensive documentation is available in the docs directory, starting with README.md. If you are migrating to SDL 3.0 from SDL 2.0, the changes are extensively documented in README-migration.md.
Enjoy!
Sam Lantinga (slouken@libsdl.org)