MonoKickstart OSX Slow

I’ve made a game using MonoGame 3.5.1 on Windows, and then I’ve packaged it with MonoKickstart to run on Macs, and it all seems to work fine, until I enter a new level, where the game slows right down to be unplayable.

I don’t know what’s causing this issue, as the first level is exactly the same as the second (it’s a procedurally generated dungeon explorer), and as I can’t debug on a Mac, I’m not really sure how to proceed.

All the code is here: