Week ago I installed the Beta 2015 version as solution for ticket YZZ-378-61721.
Two days ago I reported about the work of this version without the problems, but today my PC works very slow.
I checked by Windows Task Manager what is the problematic process and detected that process AvastSvc.exe (PID 1900, User Name - SYSTEM, Mem Usage 41,032K VM Size 56,452K) prepares massive I/O rites and I/O others - each second 32K
You can download Process Monitor tool (http://download.sysinternals.com/files/ProcessMonitor.zip) and see which I/Os avastsvc.exe process generates.