Wireless slow reconnects or slow roaming

Hi,
I have a doubt regarding wireless reconnections.
I have 2 Linksys WAP2000 access points, both configured as "access points", and a Windows XP SP2 native supplicant/client with a Ralink chipset and latest driver rt2860 version 1.4.12.0.
I set identical settings in both access points: SSID, WPA2-AES, Radius, EAP-TLS. Theoretically, this should make roaming seamless.
However, the whole roaming process takes at least 35 seconds (during which I have no connectivity; so it's lethal for real-time apps).
This 35-second time lapse also occurs when I only have 1 access point and go out of its wireless coverage and then back in. ie. it ALWAYS takes 35 seconds to authenticate, whether it's roaming or not.
What could be the root cause of this?
Is it just a Ralink driver issue?
Does anyone have experience with this driver and are there options I could tweak (haven't found any useful options yet)?
Thanks

Actually, this 35-second time lapse also occurs when the supplicant goes out of AP's coverage and then back in. Imagine just one AP and one client (no roaming) going out of wifi coverage (until I get the Win XP "hardware error" message and the nic status is "disconnected") then back in quickly (I physically move the client towards the AP).
WDS shouldn't make a difference in this case. Yet it acts the same way. It takes a long time to reauthenticate or reassociate.
Actually, I think it's an association problem because a test I performed today while looking at the radius server log showed that:
It takes the client around 35 seconds to "associate" and/or "authenticate" to the access point via the Radius server.
I don't see any messages at all in the Radius server log until these 35 seconds pass.
The Radius server messages are processed quickly and in a matter of 2-3 seconds the Access-Accept message is sent and the Win XP client immediately accesses the LAN (continuous ping test).
So I'm deducing that communication coming back from the Radius server to the supplicant via the access point is quick and clean. It looks like the bottleneck is when the client "sends" to the AP, ie. it doesn't "associate" quickly enough.
Now, how can I determine if this is a "wlan driver" issue or if the problem is on the WAP2000 access point?

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