This is not a new issue, but now I think I have understood fully the reason.
With RTX ON, the game is likely limited in performance and could go below 60 fps
With VSync ON, as the framerate drops, it triggers something and further limit the frame rate to 30 fps
This particularly easy to happen as the light level is slowly changing during evening/dawn. There is a point where suddenly it becomes bright or darker, and that is the point framerate drops from 60 to 30 fps.
To recover temporarily, toggle fullscreen in and out by clicking F11 twice. This solves it until it happens again, likely triggered by 3
This should probably recover after the change, but this was not the case due to some kinds of bug. Disabling VSync can solve this problem completely.
Could you
Check if the above is reproduced
Provide a simple toggling switch in game to disable VSync, instead of relying on modifiying the option.txt?
Comments 5
I should also add that it happens even though now I turned off VSync for the game. Whenever it changes from midnight to day or day to night, all lava or candle lights will be gone and framerate dropped to single digit, which is otherwise 45+ on my 3070.
Cleaning up old tickets: This ticket had been set to 'Awaiting Response', but has not received a response from the reporter (~3 months+) so is being closed as Incomplete. If you feel this is still a valid issue then please comment, or create a new ticket following the Issue Guidelines which includes steps to reproduce the problem.
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please check if this still an issue in 1.20.1