I recorded FPS lag that become an issue from 1.8 pre releases, on 1.8 snapshots FPS was smooth and really great.
Video http://youtu.be/4NHCWaNcMLU
I don`t know why it`s happend, but it`s an issue, FPS constantly lagging/twitching and so on.
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It`s not the same bug, i`ve got 160-60 stable FPS on latest snapshots, their optimizations works great for me, but after PRE releases it`s become a problem.

it`s duplicate of that https://bugs.mojang.com/browse/MC-68080

Same here, everything was fine with the second to last snapshot before the pre-release. After that, everything went down hill.
It gets pretty annoying when people assume its just a hardware problem, its the most convenient answer to give to someone when you don't know what is really going on.
Hopefully the devs do something about this, minecraft is unplayable as of right now with the 1.8 launch.

@John Galt Over there still opened bug, man.
https://bugs.mojang.com/browse/MC-68080
Here he closed it.
Duplicate of MC-45458