All Video settings are set to lowest possible... but im trying atm to relocate more memory to it.
---------- Post added 2011-10-29 at 04:24 PM ----------
So I made minecraft run on 2 gb of ram instead 910 Mb, but it doesn't seem to solve my problem... still laggin while opening doors and when redstone circuts start. I don't know what's actually wrong. I have the newest Java aswell.