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Dont report graphical bugs with optifine installed if you find a issue and u belive it will happen with out optifine please try first :)
please post crash logs just saying "i crashed" does not help at all we need access to the crash report to learn more about this please look here http://docs.mym.li/en/latest/Knowledge_Base/crashreport.html
im lagging help firstly just shouting at us about it doesnt help use http://docs.mym.li/en/latest/Performance/index.html to learn how what you are doing effects you and the server