So far No problems Found, installed on XP 32bit SP3 System, old as dirt laptop, system performed well with it installed, did a smart scan, and one full scan, no issues to report as yet, will be testing further over next couple days
Installed also on Windows 8.1 Pro 64bit Desktop--System performance great, Remote Desktop use from Windows phone excellent, no noticeable problems there, Sleep mode on 8.1 so far working properly, no noticeable issues to report otherwise at the moment, continuing to test and will report any issues I find in the R2 beta
Avast Crashed--when selecting remote control of Laptop PC from Account, Allow Remote control of this PC was checked in trouble shooting
Picture below from Laptop machine