Network slow after 10.4.5 update

Hi there, after installing the 10.4.5 update my PowerBook 12" is really slow when accessing network services. Web, Mail are impossibly slow.
I have a cable modem broadband connection with a Belkin wireless router sharing the connection. The laptop connects via Airport and uses DHCP for autoconfiguration.
I have tried the fix suggested on MacFixit of putting the DNS manually in the TCP/IP settings. Also I have turned off IPv6 which was also suggested to no avail.
My other laptops with earlier system revisions are running fine (I am using one to write this) and I have tried the Mac on another network with the same effect so it has to be something that 10.4.5 has done to my poor alubook
Can anyone help please.
PowerBook 12" 867Mhz 1.12GB RAM Mac OS X (10.4.5)

This was offered by MacFixit: Friday, February 24 2006 @ 09:30 AM PST
Mac OS X 10.4.5 (#9): Another fix for network slowness -- re-applying the combo updater; SIIG FireWire card not working; more
Another fix for network slowness -- re-applying the combo updater Over the past few days we've outlined a number of fixes for network slowness that occurs after the update to Mac OS X 10.4.5, including entry of a DNS address, toggling of IPv6 and more.
We've now received notes indicating that a tried and true workaround for various issues -- re-applying the Mac OS X 10.4.5 combo updater (as noted in our general workarounds for 10.4.5) -- can have beneficial effects in this case as well.
MacFixIt reader Fred Moore writes:
"After much thrashing about and wasted time, I appear to have solved both the slow web page loading as well as my email sending problems in one stroke. Guess how: download the Mac OS X 10.4.5 combo updater and reapply it. This nonsense has cost me a lot of time but everything seems to work now. IPv6 is set back to Automatic, there is no entry in the Network prefs DNS server field, and my email sending works perfectly (so far; I've sent a bunch of tests). Why didn't I just download the combo updater and apply from my hard drive at the beginning? Well, Software Update should (yes, I know, I know...) work. I'll never again use Software Update for a system update."

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Message was edited by: Farlander
Message was edited by: Farlander

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1 2.5 GHz Intel Core i5 CPU: 2 cores
4 GB RAM
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EFI (disk0s1) <not mounted>: 209.7 MB
Macintosh HD (disk0s2) / [Startup]: 499.25 GB (447.75 GB free)
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HL-DT-ST DVDRW GS31N
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Apple Inc. FaceTime HD Camera (Built-in)
Apple Inc. Apple Internal Keyboard / Trackpad
Apple Inc. BRCM20702 Hub
Apple Inc. Bluetooth USB Host Controller
Apple Computer, Inc. IR Receiver
Thunderbolt Information:
Apple Inc. thunderbolt_bus
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Mac App Store and identified developers
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[loaded] com.adobe.fpsaud.plist Support
[loaded] com.microsoft.office.licensing.helper.plist Support
[loaded] com.oracle.java.Helper-Tool.plist Support
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[loaded] com.oracle.java.Java-Updater.plist Support
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iTunesHelper
Dropbox
Internet Plug-ins:
FlashPlayer-10.6: Version: 14.0.0.145 - SDK 10.6 Support
QuickTime Plugin: Version: 7.7.3
Flash Player: Version: 14.0.0.145 - SDK 10.6 Support
Default Browser: Version: 537 - SDK 10.9
SharePointBrowserPlugin: Version: 14.4.1 - SDK 10.6 Support
GarminGpsControl: Version: 4.0.3.0 Release - SDK 10.6 Support
Silverlight: Version: 5.1.10411.0 - SDK 10.6 Support
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AirPlay: Version: 2.0 - SDK 10.9
AppleAVBAudio: Version: 203.2 - SDK 10.9
iSightAudio: Version: 7.7.3 - SDK 10.9
iTunes Plug-ins:
Quartz Composer Visualizer: Version: 1.4 - SDK 10.9
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Flash Player Support
Java Support
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Please answer as many of the following questions as you can. You may already have answered some of them; in that case, there's no need to repeat the answers.
Restart the router and the broadband device, if they're separate. Any change?
Run Software Update and install all available updates for OS X or the computer's firmware. Any change?
If possible, connect to the router with an Ethernet cable and turn off Wi-Fi. Any difference?
Are any other devices on the network, and if so, are they the same?
If you can connect to more than one network, are they all the same?
Are all network applications affected, or only some? If only some, which ones?
Is networking always the same, or is the problem intermittent?
Disconnect all other devices from the network. Any change?
If you're running a MacBook with the lid closed, open the lid. Any difference?
Start up in safe mode and test. Any difference?
Start up in Recovery mode. From the OS X Utilities screen, select Get Help Online. A clean copy of Safari will launch. No plugins, such as Flash, will be available. Any difference?
If possible, turn off Bluetooth and disconnect any USB 3 devices. Any difference?

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