Why does Safari run quickly on two machines but not the third?

Hi all,
I have a curious and frustrating problem. There are three Macs in one room (G5 PPC, iMac G5 Intel, MacBook Intel). The two intel macs are connected to the internet via Airport, the PPC via ethernet. Until a few weeks ago all three Macs ran Safari at the speed of light. Now the PPC has slowed to snail's pace or worse.
I have read loads of posts, I have cleared caches, reset safari, thrown preferences and bookmarks away, you name it, I think I did it. Been onto the ISP, reset the router. I even did a system reinstall.
This is amazingly frustrating as I can load a page on the other two Macs in less than 2 seconds, while timing the PPC, the same page takes over a minute.
I have had some hardware issues, but they were resolved by an erase and install about a month ago. So now I am wondering if this is indicating that I still have an underlying hardware issue?
Any ideas?
Thanks.

I rather doubt it is a hardware issue, much more likely to be software issue or a connection issue.
Do you use open DNS?
(First, if yours is an Intel Mac, check that Safari is not running in Rosetta, which is enough to slow it to a crawl.)
Adding DNS codes to your Network Settings, should gives good results in terms of speed-up:
Open System Preferences/Network. Double click on your connection type, or select it in the drop-down menu. Click on TCP/IP and in the box marked 'DNS Servers' enter the following two numbers:
208.67.222.222
208.67.220.220
(An explanation of why that is both safe and a good idea can be read here: http://www.labnol.org/internet/tools/opendsn-what-is-opendns-why-required-2/2587 /
Open DNS also provides an anti-phishing feature: http://www.opendns.com/solutions/homenetwork/anti-phishing/ )
Wikipedia also has an interesting article about Open DNS:
http://en.wikipedia.org/wiki/OpenDNS
Whilst in System Preferences/Network you should also turn off 'IPv6' in your preference pane, as otherwise you may not get the full speed benefit (the DNS resolver will default to making SRV queries). If you want to know what IPv6 is:
This is Apple's guidance on iPv6:
http://docs.info.apple.com/article.html?path=Mac/10.5/en/8708.html
Click on Apply Now and close the window.
Restart Safari, and repair permissions.

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Nancy O.
Alt-Web Design & Publishing
Web | Graphics | Print | Media Specialists
http://alt-web.com/
http://twitter.com/altweb

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