I own a 900 MHz G3 ibook (v2.3) with 256 MB of ram running 10.2.8. It's been good to me, but over the years it's performance has started to decrease. Most applications load up and run fine, but web browsers can become a little slow when I have multiple windows or tabs open. What should I do to get rid of this problem? Upgrade the memory to 640MB of ram? Update the OS to 10.4?