Normally while playing my frame-rates are totally fine (60+), but when flying near large pools of lava, especially in the nether, I experience massive amounts of FPS loss and freezing. This happens both with and without any client mods (I've tried vanilla, with MCPatcher, with Optifine - nothing makes a difference). The debug window also shows sound shooting up massively during the FPS loss.
A few others on my server have confirmed having this issue too, and there does not seem to be any particular common denominator that's out of the ordinary.
The freezing and fps issues stop when you disable sounds, so I can only assume it's due to the massive amount of popping and lava-ish sounds happening all at once.
I attempted to try it just without the lava sounds in particular, but Minecraft seems to be smart enough to just re-download the sounds when i remove or overwrite them!
Some looking around also led me to forum posts with others who are having the same issues, it seems to be fairly wide-spread and definitely involves lava and sound.
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Possible duplicate of MC-560, marking as related at least for now as a possible extra use-case for testing
Another related issue MC-1538 involving many sounds playing simultaneously causing lag.
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
Resolving FPS losses caused by sound to MC-46.
Screenshot of me sitting in the nether. FPS is good until I drop down near the lava, then it just crashes and sound jumps up massively as seen here.