Some lag issues in outdoor areas

Recently I have been playing The episodes Underdark Overbright and Quofee and for some reason every time I am in a level that has outdoor areas everything slows down and lags and the music/sound effects are all jumpy. This does not happen in other maps I’ve played. Just encountered it with these. Any ideas??

What source port are you using?

Quakespasm. 0. 93. 0