I got eleven tabs open in Safari and it was brutal.
Text in Comment forms would take a minute before it would display.
Everything was slow slow slow.
It didn't used to be this way. I could have like twenty Fox tabs open and have no degradation!
It's as if something is hogging CPU cycles -- but there's no malware here, dammit!
RAM was adequate to the task. Load got to 46%.
But still: brutally slow.
I think I will ditch this version of Firefox and go with 3 to see if there's any improvement with that.
I doubt it, but let's see.
Oh, and I turned off avast! anti-virus to see if that was the slowdown. No change!