Bug: Huge amount of lags when moving away from sound-making generators (SP only)

I run IC^2 1.15 and every time in SP when I create the watermill or the nuclear reactor core, and they start making their custom sounds, everything runs fine. But as soon as I move more than ~20 blocks away and cant hear them anymore, huge lag comes. The more generators I cant hear the more lag I get, up to the point where I cant play anymore.

And upon returning real close to the generators the lag stops. Completely.

This does not crash the game or give any error report, and I'm not sure if its a glitch or a bug, or if it has to do with any mods installed (only got IC, BC, TMI and SCP)

I couldnt find the config file, but removing all custom sounds from the jar sure made it work :3

EDIT: I just restored from a backup and removed just the nuclearloop and the watermillloop and now I can run with still the other custom sounds without any problems. Thanks!