Funny, I updated and noticed a remarkable increase in FPS.
However loading new chunks seems to have been reduced to the point where it sometimes appears to stall, and you have to "visit" those chunks to get them loaded in.
On some occasions even chunks right in front of my character didn't load, but visiting them in build mode usually helps, if you can use build mode, that is.
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that sounds crazy,I didnt update it yet (I like to wait a few days for all bugfix updates to come out first)
That's the sensible thing to do, and always remember having a fresh and
working backup before updating...
But this sounds like the update did a full reset to default configs. and graphics options.
So if you had custom options in configs and graphics options,check them and change them back to what you had before.
For me, the only changes were to keyboard.cfg (those were a pain however), but I didn't notice anything serious affecting other settings.