Hey so my minecrafts been playing up now whenever i go on my single player world it closes minecraft down after about 20 seconds. I have optifine mod installed because I want minecraft to have higher fps as i used to only receive about 5 fps which was VERY laggy so does anyone have any ideas on why this is happening? Maybe ive installed it wrong. Could anyone post instructions on how to install correctly. Maybe its nothing to do with the mod and it happens to loads of people i dont know. Anyway thanks for taking your time to read this