Ever since I updated to the Snapshot 13w04a(also 13w03a), I've had massive FPS Drops in the Overworld, which has made me pretty much unable to play. This doesn't affect any other dimension, as I have about 96-160 FPS over all in the end, and 110-180 in the nether. Back in the later snapshot (13w02b) I never had this problem. But now I can't get more than 16FPS in the overworld.
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Switch to the default texture pack and see if that changes something.
And please attach screenshots of 13w03a and 13w04a with the F3 debug screen shown.
Just a couple of minutes after each other, I couldn't use the "Attach Screenshot" so I just uploaded it as a file.
This is not a duplicate, since the other ticket is about FPS going down for a couple of seconds, then going up again. Mine stays down for the whole time, thank you.
It could just be an problem with your computer. I know my friends computer does this but his old one didn't. It is an hardware or java issue. So this is an duplicate.
I have a mac too, my fps fell to 7 on this new snapshot , it's not a duplicate, maybe it only happens with macs
Please force a crash by pressing F3 + C for 10 seconds while ingame and attach the crash report here.