WiFi card makes initiating a connection on other cards very slow.

Hi All -
Java 5
Windows XP, 2000, and Adv. Server
We do programming for multiple closed networks, so my development box has 4 NICs, each going to a different isolated network (each has its own subnet).
All was well until recently we had some WiFi cards installed in our machines. Now initiating a socket connection on any NIC that is not on the same subnet as the default gateway takes a long time - about 30 seconds, but it can vary. Once the connection is made, its just as fast as ever, but creating the connection takes a lot of time.
The strange part is this: it doesn't matter if the Wifi card is even in use at all during the transaction, merely having it enabled as a card causes the problem. I have tried modifying my routing tables so that the only option is the correct one just to see if that makes a different - and it doesn't.
This problem is reproducible on Windows XP, 2000, 2003 server, on at least 5 completely different computers, and in Virtural PC. The only thing they all have in common is the same D-Link WiFi cards.
Take this example:
NIC 1: 192.168.1.x -> default gateway is a 192 address, this is the card that connects to the internet. All connections are fine using this card.
NIC 2: 10.30.100.x -> Wifi card. This card is enabled but not being used for this transaction at all.
NIC 3: 128.0.0.x -> Normal card, any attempt to open a socket with the Wifi card enabled takes a long time.
NIC 4: 10.10.10.x -> Normal card, again, the Wifi card being enabled will slow down the opening of a socket.
This configuration is merely an example, I have tried changing which card services which subnet, what cards are enabled or disabled, more cards, less cards, multiple IPs per card, single IPs per card - nothing makes any difference either way except for enabling the Wifi card slows it down and disabling it solves the problem.
I've also disabled 'Wireless zero configuration' on advice from another network programmer - makes no difference either way. I've also tried binding to various specific local IPs, tried different servers to connect to (and different types of servers). and tried pretty much every constructor available for Socket. This did not change anything.
Anyone else experience this? Any more information I could provide to help solve the problem?
Thanks!
Jason

edex67,
I'm new to wifi so the info you sent, i.e.; inSSIDer, is something I didn't know about. So thankX for that. Interference not part of the problem. I did change channels from 11 to 5 as some of the neighbors are on 11 and 6. That didn't help. 5 Ghz change doesn't help either. Have reset to factory specs twice along with deleting my first network and beginning from scratch. Still didn't speed things up. ISP isn't a problem either. Separate diagnostics shows download speeds great. I've even restored my computer to a previous date when the Airport Express was screaming downloads. The slowdown happened yesterday as I was trying to set up my old computer; changed motherboards and can't access the internet, needed to find drivers on line and somehow in the process Airport slowed to a crawl. Must have changed something and can't get back to the speed of yesterday morning. Have been working on this since 8 AM. Did I mention that I hate Microsoft?
So, even restoring factory specs and installing from scratch doesn't get me back to speed.

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