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Seems like Parallels is always touting faster performance with each new major release. However I just upgraded from 8 to 10, and things are MUCH slower. I even had to drop CPU (from 2 to 1) and memory (from 12GB to 10GB) on my Win8 VM to make things run a little smoother. It's still pretty sludgy. I'm not sure why I dropped $50 to upgrade if it's not really an upgrade. PD 8 ran pretty well for me. I only upgraded because I kept getting the nag screen to upgrade before updating to Yosemite or else PD wouldn't work. I did follow the performance FAQ and that didn't really help much.
My system for reference:
MacBook Pro (Retina, Min 2012)
2.6Ghz Core i7
16GB DDR3 1600MHz RAM
500GB SSD drive
NVIDIA GeForce GT 650M 1024MB
Host: OS X 10.9.4
Guest VM: Windows 8.1
I do not know, sorry ... but I am totally confused by what you did to fix it. Seems opposite. I would generally add number of CPU to increase the speed of VM. Or are you having problems with OSX speed?
Not sure what you are doing, but I have number of VMs at home and work, and none ever needed more than 4Gb of RAM. Eve n that seemed overkill usually... Of course, depends on what you need. But if you have 16Gb total RAM and assign 12GB to Parallels VM, there is very little left for OSX programs.
On my i7 system with 4cores/2threads (=8 fake cores) and 16Gb RAM I assign 3-4 cores and 4Gb to Parallels VM (Widnows 7) and all is running perfectly smoothly.
One thing I do is increase video RAM.
This balances OSX/VM for me reasonably well for me... But as I said, depends on what you do in the VM - what resources it needs.
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OK, just to follow up. I tested more or less the same hardware as WickIndy, may be slightly newer MBP and with PD10, Windows 7, 4Gb RAM/4 cores for VM, all seems to be working just perfectly fine. If anything PD10 seems to be faster reacting (start/stop,...) then PD9.
One thing I'd suggest anytime speed becomes issue - often I find out that my SSD developed problem and needs to be fixed with Disk Utility. OSX seems to have resistance agains catastrophic failures, but small drive issues cause read/write slow down. Serious. Every time I suspect something, I boot in recovery partition (cmd-r on boot) and run Disk utility. Sometimes it finds problems and helps. Does not hurt...
One thing I'd suggest anytime speed becomes issue - often I find out that my SSD developed problem and needs to be fixed with Disk Utility. OSX seems to have resistance agains catastrophic failures, but small drive issues cause read/write slow down. Serious. Every time I suspect something, I boot in recovery partition (cmd-r on boot) and run Disk utility. Sometimes it finds problems and helps. Does not hurt...