Hello,
Minecraft 1.8 and most of the snapshots have major lag issues. Standing still, looking around relatively slowly and maybe having a nice walk, I get 70+ fps. Then, if I maybe fly around or start to sprint and look around faster (such as PVP) I drop to frames around 12 fps. This fps issue seems to be so extreme I believe it to be a bug. Problem consists regardless of whatever video setting I use. I also asked some friends of mine and they have the same issues. I even think people with amazing computers, such a BdoubleO(youtuber) is being affected by this; though, not as severe. I have followed several tutorials and did tons of research. People say the the lag is related to water but its not for me. But I have done some tests to narrow down to as where the problem is. I found that moving around I lag whenever my cpu usage goes to 100%, and then, my gpu usage goes from 99% down to 10%. Clearly my cpu is the bottleneck here. But the big thing is: I don't have that bad of a cpu. Sure, I should get a little lag when moving around and loading new chunks, but this is just too extreme.
Back in 1.7 I got 90+ fps almost always and when moving around I dropped 0 frames. This is a pretty important point as it shows that this is something that they did to 1.8. I have tried turning VBO's on and off; doesn't change a thing.
Also, if you are reading this, PLEASE PLEASE add back the anisotropic filtering and advanced openGL option. I think a big amount of this lag could be fixed with an advanced openGL option and I also have some rendering glitches without the anisotropic filtering.
Kind regards,
Huni