Lag???

I've had this happen a couple times today where beach theme levels I've made in quickmode have become unexplainably laggy even though they weren't before. It may be coincidence that I've only encountered it with the beach themes so far but I'm not sure.

It could have something to do with the cheep cheeps since getting rid of a few fixed the issue in the koopa troopa beach course i made but there are the same amount or maybe even less fish in the other beach tracks that are lagging

I'm stumped. Courses that ran fine on their own started lagging when they were part of a cup, regardless of theme. Maybe it's just a server issue?