Not responding during optimization

Hi Spotware,

I am optimizing my robot on a Windows 2012 server on a virtual server (4 virtual processor, 8gb RAM).
After starting optimization everything goes well until, after a while (around 100000 passes), Calgo starts to get slow an freezes for few seconds several time, it gets worse when Calgo is "not responding" several time for few seconds. Then in the end the process would get blocked on "not responding"

I don't know if the optimization is still going on at this point, the process seems to still use the processor and memory.
The memory consumption is about 65%.

I always minimize calgo during optimization so windows does not have to load charts unless I want to check estimated time remaining.

I also used an other server with 16 virtual processor and 32gb RAM this time, I experienced the same issue.

Is there a way to fix that issue?

Thanks