It bothers the hell out of me that it takes so many resources to browse almost as fast as I could on a P3 or G3 15 years ago. All for lots of “features” that I would gladly do without.
The P3 Tualatin chips are quite decent, those are the basis of the later “Core” CPUs - the P4 was a dead end.
Although I like Firefox OK for daily use, most modern browsers are bloated crap, Unfortunately, this is because of servers hosting dynamic pages, which I hate. Once I render a page, I need it to stay still. The idea that the user determines their own experience has become foreign to people.
For those with minimal resources, I recommend a text-based browser, such as the Links family. I have used ELinks with some success. The better of these are smart enough to render stuff with little overhead and not miss much. They are also good for mouseless browsing, if that interests you. Some will inevitably complain that text/character/console web browsing is missing some contemporary widget or other, but obviously those are not the point. If it works for most of your browsing, maybe you can save the odd difficult page for a full-featured browser.