SC remastered/cartooned keeps freezing

SC remastered/cartooned keeps freezing up every 0-5 seconds. When I randomly click something it resumes again. Quite unplayable.

Model Name: MacBook Pro
Model Identifier: MacBookPro13,3
Processor Name: Quad-Core Intel Core i7
Processor Speed: 2,9 GHz
Number of Processors: 1
Total Number of Cores: 4
L2 Cache (per Core): 256 KB
L3 Cache: 8 MB
Hyper-Threading Technology: Enabled
Memory: 16 GB