This issue happens not only with AIS but also with Free version. I confirmed this issue using both avast!5.1.x Free and AIS 6.0.1125.

Even there is no real file transfer (checking file-size and file-date only, aka file synchronization) avast slows this down.

The most strange thing is that no shield seems responsible for this slowdown. I uninstalled all avast shields (no real-time shields, WebRep or anything) but this issue still persists. :frowning:

I’ll try uninstalling avast and reinstall it with no shield installed.