IMac 500 mhz powerpc G3 - Internet connection slow, how do I fix?

So here it goes, I am pretty much a clueless newbie as far as the computer goes. But I have this much worked out. I am running a iMac G3 500 mhz powerPC (Thanks!, about this mac) with 512 kb of L2 cache, 100 mhz bus speed and 128 MB SDRAM on OS 10.3.9, and I have a wireless card installed that has firmware version 9.52, which I am using to connect to the internet through an apple airport, connected to a Motorola Surfboard SB5120 Cable modem.
Now when I am on the iMac the internet feels like dial up, I can literally stop to read magazine articles while I wait for the internet to load pages. But on the other computer a g4 apple powerbook (silver), it is quick and snappy. Both of these computers use the same airport and modem to connect.
What Can I do to the iMac to bring the speed up?

Tom's right. a G3 is a G3... but bump that RAM up even to 384 would be better. You "could" go up to 1GB, but it's up to you to decide the cost effectiveness of that. At OWC to could get 2x256 for about about $50 or 2x512 for for about $140... so the difference is pretty big. But I know the pricing is pretty competitve and you might find the 512's cheaper.
Good luck!

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