MinerAl said:

You'll need to mess with some jumpers on the Logic Board to change the speed, even with the new ZIF CPU installed.

http://lowendmac.com/1997/overclocking-beige-power-mac-g3/has a nice table relevant to your needs

Looks like 66MHz @ 7x would put you at 466MHz, which shouldn't too greatly overtax your 450 chip.

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Jumpers and I are very well acquainted with all the years I spent futzing with Socket 3, 5, 7, and Super 7 boards on the PC side of things and that chart is exactly what I need.  I wouldn't have figured that Apple would have been nice like the PC guys and silk screened that onto the board itself.

trag said:

The Enet, USB, FW combo cards were made by SIIG and the part numbers are JU-2Ne012, JU-2NG011 and JU-2NG012.  The latter two are gigabit and much harder to find, although there are none of the former on Ebay at the moment.   Some Macs do not work properly with PCI-PCI bridges, which is the magic chip which lets a card like this put three PCI devices in one slot, so whether you'll get full functionality from such a card is in question.

Also, if the hard drive is original, replace it with something, anything, more modern.   Even though the ATA interface is only 16 MB/s, Apple's original hard drives in those machines were still much slower than that.   Even better is to add a disk interface card such as an Acard AEC-6280M or AEC-6290M (fomer = PATA, latter = SATA) along with a newer drive.

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That's exactly the card I was thinking of, guess I'll have to set up a search to monitor for when one gets listed.  Worst case scenario I get a 10/100 card and a Firewire/USB combo card.  Hard drive was replaced before I got it with a 40GB Seagate so I'm definitely all set for space.  I have an extra Sonnet ATA/100 card around that I could toss in as well, though wouldn't that affect my ability to boot from CDs?

Bunsen said:

"A slightly less frustating crawl" is probably realistic. No fault to Classilla, which is a nice piece of work, but the internet just is that demanding these days.

If you are 100% sticking with OS 9? Probably not. But max it out to 768MB if you plan on using OS X or any kind of unix/linux ever.

I notice you haven't mentioned video upgrade.

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I don't have high expectations, given how the web performs on my iBook G4.  This machine isn't used for much web browsing, just downloading files that I don't already have on the server or on some random flash drive somewhere.  100% sticking with OS 9 as I've got an iMac G4 that covers the OS X side of things.  As far as a video upgrade is concerned, how would that work with this being an all-in-one? 

Thanks for the suggestions guys, sounds like it's definitely worth $28 to give the processor a bump (and probably another $20 or so if/when I can find the combo card)