Minecraft fps really low and mouse sens messed up:?

I did a Factory restart downloaded minecraft and when i ran it before i was running it at atleast 100 fps min and everything was fine. I reset my pc and now i cant seem to get higher than 25 and when it is playable my mouse sensitivity goes up to like 1000 for some movements, i have all default settings and it's really annoying, thanks! :)

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