So I took the RAM from the G3 and installed it in the Cube temporarily to see if more RAM would make it easier to use on the web, and while it's obviously not going to be as fast as a modern day machine, it can definitely be used as a main web machine if need-be, and that was with only 512mb of the stuff, it would be even better if it had the full 1.5GB in it. As for the iMac G3, well, I'm typing this message from it! I found a lighter web browser, OmniWeb, that seems to load pages much quicker than TenFourFox, even with the tweaks listed on this site. Albeit TenFourFox loads them better, OmniWeb has issues loading certain elements.