In an earlier thread called And another thing... I was moaning about the (sudden lapses in) performance of Firefox.
Well, it keeps running hot and cold, but that's OK. Today's minor experiment was to see whether a clean Chrome installation did any better. I HATE to say that it sure does! It races along.
I don't know if it's the right term, but Firefox seems to not "ping" the sites properly. There is the little wheel that spins backwards for ages first, before it turns green and spins forward and loads. Sometimes I have to reload the tab first, and sometimes that gets it going again.
Look, I'll keep working on it - thinking of a clean, basic re-installation of FF - but this is just to let you know.