I downloaded minecraft the other day and it was running well. The max fps was about 250 and it would stay between 100-150 most the time but whenever i went to a part of the server where a lot of people were it would drop to as low as 50. Now since today i logged in and my fps was between 10-40 at all times! I turned on Advanced Open GL and it boosted it a bit but made it even worst near other players. I've allocated more ram, installed optifine etc. but it's still low? The first thing i did was play BF4 on high/ultra and although i didn't have an fps counter it was very smooth.