Well with a Mac, according to it's Activity Monitor, some really wild arse programs can, or at least appear to. Bottom line, whatever the actual usage is it's off the charts. And wreaks havoc on the speed and efficacy of browsing.
Took quite a bit of digging to realize that the Am Ex web site was the whole cause of this issue. That's after restarting FF and the computer several times over a couple hours trying to clear out whatever was clogging up the works.
Quite a feat for one ol simple CC web site given I've been running with three windows active, one having 30-35 tabs open at a time, multiple videos going, etc. for the better part of the past several weeks and not one bit of trouble, with FF typically less than 20% of CPU usage, with 5% or less when 'idling'.
Looking to obtain an American Express Blue Cash Card, but if that's the best they can do, running a web site such that it can't handle simple tasks like everyone else's can without overloading their users computer then it really makes me wonder how well they can handle the important stuff, notwithstanding all the praise they get for being such user friendly folks.
Installed NoScript which I'd been doing just fine without 'thank you very much' AE, until now, in order to get it under control soes I could have their site open without things gone all to hey. Which means so long as it's needed I have to dink around with NoScript for every other site when it wasn't at all necessary before.
While it 'appears' one can use their site anyway, I won't know for sure how well until I pull the trigger to join up, with their scripts blocked one gets...
Reckon we'll see... Sure hope it doesn't prove to be a requirement for every time I wish to access an account with them.