MBP increasingly slower when not connected to network

When connected to the network at work (either through WiFi or ethernet cable) my macbook pro works OK. However, when I am travelling or take my MBP home performance starts degrading to a point where launching something like Dictionary can take 15-20 seconds.
I get a spinning beach ball when launching or closing applications, as well as when saving files. Typically when disk operations are involved.
Originally, after reading some posts in this forum, I thought that it was a hard drive problem. However, I have used the tools that come with the installation disk and disk warrior showing no problems. In addition, the problem always sort out itself after rebooting while connected to the network at work.
Trying to find the missing network could be a problem, but going through the logs in console I can not find anything like that. The other issue is that performance degradation compounds with time since being connected to work. I can' figure out a reason for this.
Any suggestions pointing to a solution are most welcome.
Macbook Pro Mac OS X (10.4.9) 2GHz, 1.5GB RAM

After playing for a while with the computer I think that I have at least found where the computer is wasting all this time.
Using Console and checking system.log, I found several instances of "DirectoryService[46]: Active Directory: Could not determine closest Domain Controller from Site information in directory". I did use "sudo killall -USR1 DirectoryService" in Terminal to send debugging information to /Library/Logs/DirectoryService/DirectoryService.debug.log.
Here I can see that every time I have a delay, the computer spends 25 seconds trying to reach a LDAPv3 server at work. So, it seems to be a misconfigured network problem, which I hope to sort out tomorrow.
Macbook Pro Mac OS X (10.4.9) 2GHz, 1.5GB RAM

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Attachments:
WriteExcelExistsTEST.vi ‏113 KB
Row Col To Range Format.vi ‏17 KB

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