Abdul, with all due respect for your knowledge, credentials and experience with your product, I have lived in the Parallels Control Center until I'm blue in the face. I have tried virtually every conceivable configuration and came to rest with 1-CPU and 2048MB of ram. Everything about my machine is exquisite, except, as another user so aptly put it, the 'pinwheel of death' happens whenever I try to save a file or open a new folder. Even opening an Office application in Windows is painful at first while it 'spools up'. I have a higher-end version of the MB Pro, for the purpose of increased productivity, however, I'm glad I kept my Sony VAIO as a backup to run Windows when I need to get work done in that environment. My exquisite new machine is grossly limited by your software! Sir, I am not hearing anything tangible from Parallels about these issues...they appear to be in total denial! I think others should be warned to stay away from Parallels completely until the issues with PD10/Yosemite are resolved!