Unable to access google or amazon ...

I teach in an FE college where we have a suite of G5s currently running 10.4.5, and we have found Internet access to be painfully slow in general, and next to impossible for two sites in particular: google.co.uk and amazon.co.uk.
We are accessing the Internet via ethernet, and have to use a proxy server. When using Safari 2.0.5 the above sites stall whilst trying to connect ... they don't actually crash or anything, and after about 130 seconds the sites do appear. Obviously a wait of 130 seconds is as good as not appearing at all!
Some sleuthing on my part has revealed that the eMacs that we have running on 10.3.9, with Safari 1.3.2 and accessing the Internet by the same proxy server, can access both the sites mentioned above with no difficulties whatsoever. They also seem to have much faster connections in general.
I am getting severe stick from my students over the slow net connection ... has anyone any suggestions as to what might be causing this? Is there something fundamentally different in either V2 of Safari or V10.4 of the OS that would cause these particular sites to slow to a crawl? Could it even be something to do with the proxy server - would it have software/drivers that might need updated to accommodate machines running 10.4?
Any and all help will be extremely gratefully received ... especially by the students if it leads to results!!

Welcome to Apple Discussions
V10.4.5 network protocol has a tendency to be slow, especially when using Proxy Servers. I suggest upgrading to 10.4.7 using the combined update.. Remember to "repair permissions" using Disk Utility after the restart. Also, make sure you have updated to the various Security releases (software update will let you know what they are, but first run the combined update).
Other steps:
System Preferences>Network panel>Ethernet>TCP - DNS servers - enter 4.2.2.2 and select "apply". Also, setting the IPv6 selection (bottom of TCP panel) from automatic to "off" seems to help.
In Safari, select "empty cache" from the Safari Menu.
And as always, system maintenance is essential for operating system efficiency. What type of maintenance is performed on these machines? I use OnyX
iMac G5 Rev C 20" 2.5gb RAM 250 gb HD/iBook G4 1.33 ghz 1.5gb RAM 40 gb HD   Mac OS X (10.4.7)   LaCie 160gb d2 HD Canon i960 printer

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