I have the exact same Issue. Usually 160fps. But 0..1 fps for 1-4 seconds (nearly freeze) when I walk and I'm near a LOT of lava (just above a lava ocean in nether). I replaced the lava.ogg file with a valid .ogg file of audio-length 0 ms. I put read-only flag to the file such that MC cannot overwrite it. This fixed the issue.
I suppose my CPU just has too few power to calculate massive lava sounds.
32Bit win XP latest java version CPU: Duo Core 2 / 2.4Ghz / E6600 2GB Ram
Simon Cavegn
I have the exact same Issue. Usually 160fps. But 0..1 fps for 1-4 seconds (nearly freeze) when I walk and I'm near a LOT of lava (just above a lava ocean in nether). I replaced the lava.ogg file with a valid .ogg file of audio-length 0 ms. I put read-only flag to the file such that MC cannot overwrite it. This fixed the issue.
I suppose my CPU just has too few power to calculate massive lava sounds.
32Bit win XP
latest java version
CPU: Duo Core 2 / 2.4Ghz / E6600
2GB Ram