I'm playing on a custom pc, which should be strong enough to handle any game, including SSF2. However I randomly get lag spikes ~20 minutes into gameplay. any ideas?

The game does that for everyone, even on the best PCs. You have to close the game out every so often and reload it for it to run smoothly again.

McLeod Gaming is gonna fix this in the next major update they're gonna do for the game.

ah, that's annoying. thanks for the heads up, guess I'll have to wait.

Me too