Quicken 2015 running on Windows 10 in Parallels 11 is painful. Excruciatingly slow, Window snap is off by about 35% of the screen, etc. It's just awful. Any ideas??
Make sure that your virtual machine has been given enough hardware resources as Quicken is relatively an heavy application. Kindly refer http://kb.parallels.com/112091 for optimizing virtual machine's performance.