FTB low FPS please help!

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i put it to 3 GB and pasted that in. also it gave me like this weird pop up when loading up a world say it had a bunch of mismatches or something is this normal??
 
i put it to 3 GB and pasted that in. also it gave me like this weird pop up when loading up a world say it had a bunch of mismatches or something is this normal??

If you removed a mod or changed configs, yes.