Hello.
I ran it in Workstation and noticed similar things when the memory is reduced. I ran it with 6GB and it seemed to work reasonably well, but when I started dropping the memory it just got worse and worse. It might be worth giving it more memory just to see if it corrects.
Good Luck!
Brian Atkinson | vExpert | VMTN Moderator | Author of "VCP5-DCV VMware Certified Professional-Data Center Virtualization on vSphere 5.5 Study Guide: VCP-550" | @vmroyale | http://vmroyale.com