In Minecraft preview, when you put the quality to max the fps are really low (10-15 fps) while yesterday the fps were stable and high (60fps) with the same settings
MCPE-208100
Fps bug Minecraft preview
Resolved
Invalid
0
Thank you for your report!
However, this issue is Invalid.
Simply stating that "My game has low FPS" is not helpful for Mojang to diagnose your issue. If you can pinpoint a specific cause when this happens for you, please open a new report for that specific issue. If you think this might be a hardware issue please contact Community Support as they might be able to help with your issue.
Keep in mind that Mojang is constantly optimizing the game and simply playing the game provides feedback to Mojang on which parts cause performance issues.
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