Massive Lag when go down from a height near the Windgenerator)

Hello. This lag was present at MC1.1 and now (1.2.5) so i write here.

If you build windgenerator at a height near the clouds. Going to them, all included, and then go down, it happens consistently big lag. For example, you can fly next to them, and then jump to the ground. If the lag starts to manifest itself, then do it a few times. Mod installed - ModLoader, Forge 3.1.2.90, Too Many Items.

My English - Google translate

Quote from Ceirenthir

Try updating your LWJGL.

http://www.lwjgl.org/download.php</a>

Thank you all for your attention, it helped!