Immediately after installing Parallels 9 Windows became sluggish. Specifically, I use Word 2013 under Windows 7 on an iMac with 12 GB RAM (3 dedicated to Parallels). When typing in Word, there is considerable lag time between hitting a key and the letter appearing on screen, and cursor also gets behind text. Overall, performance is degraded. This did not exist under Parallels 8, and it began immediately after installation of 9. I have optimized Parallels settings according to knowledge base article, have uninstalled and reinstalled Parallels 9, and have done the recommended repair disk permissions. Nothing helps. I had trouble at installation and had to deal with error codes 430 and (if I remember correctly) 507. I wonder if something is still not right. Any suggestions? If I cannot fix this soon, can someone tell me how to downgrade back to Parallels 8? I can reinstall 9 at a later time, after it is patched.