Minecraft Forums

So uh... Im new to minecraft. I have been playing for close to a month and a half and just this last week i started getting fps crashes were after 20 or so minutes of playing my minecraft just goes to around 1 fps or less and i cant play. I Have optifine so i know thats no the problem. i believe its my memory but if it is why was it working before this happened? Please Help Me. I dont know what to do... Google Didnt Fix it :C