How much RAM memory do you have? How many cores?
Cocostudio is quite heavy on resources usage.
I feel it a bit slow even on native Windows.
I uses CPU even when minimized. For me, this is not problem, as Cocostudio is a great software, very usefull, and evolving. But you have to take it into account.
For virtualized enviroments, you should at least set 2 or better 3Gb of memory for the guest, and two cores (better if three), and even then, don’t expect high speed, just fine.