some red stone stuff disappear and Xray the world some seconds

windows 7 lag minecraft more than windows xp does

big worlds killing my game so i always run void world even flat world is llagy

when whater spill like from block to block it lags me even when i place whater itself in one place

some mobs are realy lagy

i know this stuff in my work like in creating maps in minecraft

i cant run big worlds or windows 7 only if im using video options mod