Before tuning anything, read the forum rules. I'm saying this because if you did, then you would know that you'd have to provide us with (at least for this case) connection speed information (among others)

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iMac G4 OSX 10.3.9
RAM 256MB
LW 4.10.5 Basic
ADSL anything from 3 to 8Mbps/around 1024kbps

"Raise your can of Beer on high
And seal your fate forever
Our best years have passed us by
The Golden Age Of Leather"
-Blue Öyster Cult-