Confirming. Unusually strong lag occurs, mostly when I'm flying around in creative and rapidly drop altitude or something.
I have looked this up on LWJGL dev forums and the answer is one of the three:
LWJGL natives (DLLs, SOs, DYLIBs) are out of date, causing the LWJGL jar to fail creating a GL context
You don't have a graphics card that supports at least OpenGL 2 (VERY RARE, I DOUBT IT)
Your Graphics card drivers are either out of date (broken) or you have the default Microsoft supplied ones (not accelerated)
This will get it running 100% guaranteed:
Update your graphics card driver. (If it is an nVidia, get nVidia drivers, if it is an AMD, get the AMD ones. Just because the driver works, doesn't mean it's accelerated)
Try running Minecraft. IF THE ISSUE IS STILL THERE, proceed to the next steps:
Go to your AppData/.minecraft folder,
Back up all your saves, settings, screenshots, etc. to a different folder,
Delete the .minecraft folder,
Run the game with the newest launcher possible (off of the Mojang server),
Enjoy the game, because there is no way it is broken after this.
To Joey Sandmeyer:
sk89 of Facepunch? 😃
Not sure.. I thought that the JSON file is valid for any texture. If this behavior was expected, then I suppose it should be changed to feature request. That being said, I think that this is crucial for GUI mods. The effect I would have achieved... 😞
GTX 470 confirming.