I Have to upgrade my mac for Xcode version to yosemite. after upgrade my windows 7 guest start to run very slowly. i saw there is memory for guest ( i have 12 GB ram, and my windows7 configured to use 4GB) but parallels 10 use only 200 MB and don't work(slow slow slow every screen opens in 8 to 10 seconds) i stopped my windows 7 and i have build windows 8.1. and i my college installs office applications. when i look at the memory windows8 use 3.1 GB altoug configured to use 4GB. and it runs well against to windows 7. But after restart i have the same problem. my mac have ram and windows 8.1 parallels vm does not use free memory and runs very slowly. need urgent help. can i configure virtual machine use all memory as configured ?