Today, Avast seems to have decided that Facebook is bad juju -- if you visit the site in any browser, with out without the Avast plug-in enabled, the computer starts thrashing; Task Manager reveals that AvastSvc is using some ridiculous percentage of CPU; meanwhile, the internet connection is dropped; no other sites may be visited and all desktop applications complain that they have lost connection to whatever it is they're supposed to be talking to. Killing the browser task does nothing to remedy the situation; finally, the computer has to be rebooted.
Adding "
https://www.facebook.com" to the Avast Web Shield's exclusion list gets around the problem. So now I have to go around to all my users and do this.
It should be impossible for Avast to thrash so heavily that no other process can run: meanwhile, this is a Skylake processor with 64 Gb of RAM.
Please fix the thing.