Depends on the G3 you purchased and how much cache it has (512K or 1MB). To get a faster system you need more RAM, an ATA/66 IDE card or a fast wide SCSI card and some decent HDs.
For example my 8500 has 704MB RAM, g3-400/1MB, a rage 128 video card with 16MB RAM, an ATA/66 IDE card with 24x IDE cdrom and 2 x 10GB IDE HDs, plus USB/Firewire. The machine feels much faster then the stock configuration. if you look around on ebay and LEMswap on google groups you should be able to find the parts you need to upgrade failry cheap over time, if you want to keep and upgrade that system. If you want something faster with less investment you can get a fast Beige g3 or B&W G3). I have upgraded Beige G3s and B&W's but I still like upgrading the older machines.
For example my 8500 has 704MB RAM, g3-400/1MB, a rage 128 video card with 16MB RAM, an ATA/66 IDE card with 24x IDE cdrom and 2 x 10GB IDE HDs, plus USB/Firewire. The machine feels much faster then the stock configuration. if you look around on ebay and LEMswap on google groups you should be able to find the parts you need to upgrade failry cheap over time, if you want to keep and upgrade that system. If you want something faster with less investment you can get a fast Beige g3 or B&W G3). I have upgraded Beige G3s and B&W's but I still like upgrading the older machines.