Modded audio causes lag spikes and occasional crashes

[Enneagon]

When loading modded music files (such as when sailing to a new tile, approaching London, or moving to a new area) the game noticeably lags, sometimes for up to several seconds. Crashes during these lag spikes are frequent but not guaranteed.

[alexamacbett]

The way that ogg vorbis (.ogg) files are loaded in SSS is different to the way wav and mp3 files are loaded. It would help a lot to track down the problem here if I knew whether these performance problems happened with all types of modded music, just ogg, or just wav/mp3.