I've started playing MC again, but I have a problem. Whenever gravel or sand fall, they are visibly SLOW and jerky. They also flash black, but this is a problem (everyone?) most people have. It makes playing the game unbearable, because I start to think of all the money I dumped into my computer ($2100 not including case/monitors) and it really frustrates me that Minecraft (heh) won't work properly.
...it's a known issue. http://www.minecraftforum.net/topic/1588717-minecarts-gravel-and-sand-flickeringchoppy-145/#entry19503281
There are no entities. Nothing lags, BUT sand/gravel. FPS = 1300. Entity count: 0/103.