Hello, I've installed Greenfoot 3.6.1 on an new Linux Mint; no problems. When I try to do something with Greeenfoot (a new Stride-project) after about 5 seconds, the whole system slows down extremly (max. speed of mousepointer on the screen : 10 cm in 10 seconds). I do not live inside the processor, but it feels like a bunch of infinite loops generated by Greenfoot. Under MS Windows 10 on the same PC it'a all OK. Thanks in advance for any hint Jochen