Put the summary of the bug you're having here
What I expected to happen was...:
I updated the game and expect the game to run as smoothly as before no problems.
What actually happened was...:
I updated the game and the FPS rate dropped from around 50 FPS(View: Far everything else default) to around 10 FPS. I still get 50 fps when I use the old launcher but this one kills it.
Steps to Reproduce:
1. Update Minecraft to 1.6
2. Suddenly FPS Drops.
3.
Related issues
Attachments
Comments

Guess for the win: Playing on a laptop, using the wrong videocard.

Please do not mark issues as private, unless your bug report is a security issue containing information that may compromise your server/client.

Duplicate of MC-15072

Try playing in fullscreen, that fixed it for a lot of people on the minecraftforums. I also had this issue and once I went fullscreen it fixed it straight away