It's because you are using hack that doesn't work. Speedhack works in biohazard perfectly (do not use "F" key) in others mod ike TDM, mutant, there are lots of chance to get client error if you use too much.
If you want to cheat in mutant mod, get 100% no recoil, 100% fast shoot, and MAX weapon DMG
fast knife too if you are mutant, but do not use long knife. Unless it's the last kill, if you do 3-4 kills with long knife you are out
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when i Hack with them i hafe just 50 Fps and when i Normal play i hafe 200 FPs 
