Browser client is fantastic and has all the features of the desktop client (including desktop notifications, if they are your thing).

Your comment sounds like what I hear from non-tech people. "My computer is terribly slow. Must be viruses. Could you clean it up?". No, your computer is fine and (mostly) malware-free. It's just the continuous cosmic inflation of website bloat.

(And then I think: if you were inclined to learn some tech, I'd teach you how to use NoScript or uMatrix. Alas, you'll probably need to buy a new machine instead.)