Restarted the Mac, since I did not trust it to be in a fully sane state. I made a few minor setting changes and quit Parallels. After another 10 minutes or so, everything woke up and started operating pretty much normally. Cmd-Tab now brought up the row of icons for all running programs, but if I tried to select one to change focus to that program (or close one using Cmd-Q) nothing happened. Eventually, after about 10 minutes more, the beachball started spinning again and I was able to move the mouse pointer. Laptop fan started up, indicating that something was doing a lot of CPU processing. Could not move the mouse pointer, or switch between programs with Cmd-Tab, or anything. And at that point the whole Mac was frozen. The settings window opened, then I got a beach ball which after a few seconds stopped spinning. Started Parallels Desktop then clicked the gear icon in the small control panel window. I decided to see if I could change any settings to improve performance. Macbook Pro mid 2012 with core i7 and Nvidia graphics, 1 TB SSD and 16 GB of RAM. I'm not going to spend good money upgrading if the new version is just as badly broken as the old one. I was considering upgrading to Parallels 13, but from the reports I have read online it is also painfully slow in High Sierra. Whatever the reasons, Parallels is currently not a practical way to run Windows. Or recent security fixes may have invalidated tricks that Parallels used to use to run faster. This may be related to the fact that the High Sierra installer converted my boot drive from HFS+ to the new more robust APFS. Things that used to be instantaneous now bring up a spinning wait symbol for minutes at a time.
#Parallels desktop 12 compatibility windows 10#
And everything in Windows 10 seems to have slowed down similarly. Start up of my Windows 10 VM used to take under a minute now it takes over 5 minutes just to get to the login screen. Just upgraded to High Sierra, and although Parallels 12 still works, it is unusably slow. Parallels 12 used to be quick and responsive under Sierra.