Older iMac with slowness and choppy graphics

Hello
I have a 2.1 GHz PowerPC G5 iMac with 1GB DDR2 SD RAM, and 10.4.11 loaded on it (well it's actually my aunt's)
here's some more specs, ATI RADEON X600 XT, VRAM 128 mo
basically applications load really slow, Safari is also slow (though it got a little better after clearing the cache and all the saved data like cookies), video is choppy across all platforms (quicktime, youtube, etc) and when using Skype (which is nearly unusuable due to choppiness) suddenly the whole system goes to sleep, in the middle of my conversations with family in europe!
what can I do to remedy this?
(1) install the latest OS? (will a seven year old iMac be able to handle it?
(2) add some RAM?
(3) update the graphics card? (see followup question to 1)
(4) drop to my knees and say a prayer?
Thanks
JC

Rund Disk Utility to verify/repair your drive(s). Boot from your installer DVD to repair the boot drive.
Try doing smc and pram reset.
Boot in safe mode. Then reboot normally.
See if any of these things improve your performance.

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Older iMac with slowness and choppy graphics

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