DNS problems after 10.5.4 upgrade

The 10.5.4 upgrade seems to have badly broken DNS on my MacBook Pro. I have tested this side by side with other computers running 10.5.3, and 10.4, and there is definitely something amiss.
DNS resolution is painfully slow, and sometimes fails altogether. Clearing the DNS cache seems to offer only a temporary solution, as I wind up in one hung terminal session after another. Has anyone else experienced this problem?

using Airport Wireless?
Try plugging a net cable into your NIC and into router to see if it persists, if using Airport wireless after 10.5.3 that is your problem. There just happens to be the DNS patch in the news about the same time 10.5.3 was released,
You are more likely to have this problem using a non-Apple router, but you can verify if its Airport by checking your System Profiler/Software/system.log file, scroll to the bottom of that log look for "Airport Beacon (Lost) messages, if so that is your problem and you will need to roll back to 10.5.2 until Apple comes up with a fix.

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    Message was edited by: Renny74

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