Thank you for your feedback! I am almost finished with the final version (at least for the Jam), and now I can see a few new things I can squeeze in there.
Were lags universal or in spikes? Maybe they occurred in certain rooms (main concern is the Crystal Room)? Crystals are quite expensive (fixed in upcoming version); World Events (how voiceovers are triggered) perform very intensive operations during one frame (fixed); Saving - same thing (this time it’s fine, saves occur in safe points), all lightning was dynamic (fixed, eeeh, presumably).
So maybe you can define where the problems occur, so I can deal with them.