Hello, I have a strange problem with FPS lag on my laptop when I run Minecraft. When I initially start MC and join a game, I get an upwards of 35+ FPS on normal render distance + optifine. This is great, except that after only 5 or 6 minutes, the game goes to crap and drops significantly to 10-15 FPS for seemingly no reason. I have no idea why it's doing this, and I hope you guys can help.
I'm using the latest version of Java. Here's my specs: http://pastebin.com/JWKwSR2f