Hello all, I am also seeing this issue since I upgraded to Parallels 13 when it came out about 2-3 weeks ago.  I have been playing around with memory, CPU, video card settings with minimal impact.
- Biggest complaint is the huge LAG in the response of the VM UI / Processing.
 
- It can take 4-5 seconds between mouse click and screen response at times.
 
- CPU % utilization does not climb more than 10-15%.
 
- I am seeing high memory utilization on the Windows 10 VM (60%) System and Compressed memory.
 
- Performance / LAG is worse in full screen mode with dual monitors.
 
- Everything was fine with Parallels 12 and Sierra.
 
My Configuration:
- 2013 MacBook Pro
 
- 2.7 GHz Intel i7
 
- 16 GB RAM
 
- 512 GB SSD
 
- NVIDIA GeForce GT 1GB
 
I am considering uninstalling Parallels 13 and re-installing Parallels 12.  Please let me know if this is advisable with High Sierra.  Let me know what other information you need.
I have also submitted my technical details: 233121873
Thanks,
Russ
					 
				
			
			
			
	
	
		
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				Last edited: Dec 26, 2017