Board Thread:Questions and Answers/@comment-5849421-20121209194918/@comment-5341333-20121209213214

i'm not an expert and i wont read a java error log to save my life but i do have a sugestion.

go to the menu - options - video

set graphics to fast

render distance normal

clouds and fog off

everything on quality off

everything on details to fast

performance read descriptions to fix these

and then try that

if it is still crashing/lagging then turn animations off and set render to tiny