We have fixed a critical performance bug that had to do with the new way of rendering tiles, which we didn't caught during testing, and which only happened when many units moved at the same time. 

Since sorting out the problem, we have tested and profiled with 100+ units moving at the same time, to make sure everything is as it should.

Thanks to our Discord member UnsubscribefromBowjinjin for pointing this out quickly to us.