in the minecraft's code under GameSettings$Options.FRAMERATE_LIMIT you can clearly see it's locked at 260fps per second. Although monitors don't support that yet good computers and monitors might soon and this becomes a valid bug where it only pushes 260fps when f3 says 1,000fps
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my bad it actually doesn't please close this issue. There is a hard coded statement saying if it's < max then limit framerate else do nothing