ADSL connection disastrous since 10.4.11 update: Help!

I have two computers connecting to a 6500 kps rated broadband line. My PowerMac G5 Dual was fine with this until I upgraded to Tiger 10.4.11 and, incidentally Safari 3. Since then the measured connection speeds (using speedtest.net) have plunged to between 650kps and 3900 kps. Not only that, but Safari has become unstable; often stalling; often needing Resetting completely.
On the other hand, My MacBook Pro 2.4Ghz Core Duo is fine with the same connection; rated speeds are between 6000 and 6500 kps.
Both computers are using an Airport wirelessly connected via a Netgear 834 router; security is WEP and I'm using Channel 6.
The MacBook Pro is running Tiger 10.4.10 (Safari 2.x) and I dare not upgrade it to 10.4.11 in view of the problems I'm having with 10.4.11.
Incidentally the problems have been worse since latest Java security updates.
Any suggestions?
I have removed all Safari's bookmarks; disabled plug-ins; deleted the .com preference file and done the usual permissions/ CRON routines.(using Cocktail)
My Power Mac also uses Opera and Firefox, both of which are showing drastically slow connection speeds as well as Safari.
I am reluctant to downgrade to 10.4.10 on the PowerMac as this requires an archive and install process and hours of work.

I see you disabled plug-ins, that's good, as most broke with 10.4.11. Did you apply the 1.1 Security Update, Security update 1.0 caused some safari crashes, get the 1.1 update...
http://www.apple.com/support/downloads/securityupdate20070091110411ppc.html
Have you Repaired Permissions, rebiited, reapplied the combo update for PowerPC-based Macs...
http://www.apple.com/support/downloads/macosx10411comboupdateppc.html
Repair Permissions afterwards, reboot.
I see you found a thread I was going to point you to already !

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