The maximum RAM on your machine is 1.25 GB. Defragmenting the files and optimizing the hard drive may help you recover some speed. The major problem people have with this machine is pushing the operating system to the limit. I wouldn't take it past 10.4.
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Standard RAM: 256 MB Maximum RAM: 1152 MB*
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Details: *Apple reports that the maximum memory capacity of this system is 640 MB with 128 MB onboard and a 512 MB SO-DIMM. However, third-parties have been able to upgrade the system to 1152 MB with the 128 MB onboard and a single 1.0 GB memory module.
The maximum RAM on your machine is 1.25 GB. Defragmenting the files and optimizing the hard drive may help you recover some speed. The major problem people have with this machine is pushing the operating system to the limit. I wouldn't take it past 10.4.