Intel 4965 to Prism based AP Problems

Hi,

I'm looking for ideas to help troubleshoot a problem I'm having with very poor wireless performance between a new laptop and my FreeBSD 4.10-Stable based AP.

Using my old laptop, there is no problem. That laptop uses the same family of wireless card (just the miniPCI form.) The 802.11b wireless cards are the prism 2.5 cards from Netgate, 2511CD PLUS EXT2, firmware 1.4.9

My new laptop has an Intel 4965. I can connect, and signal strength is excellent. I do pass traffic, as I can ping to a vhost I has on the Internet and do not see many drops. However, web traffic from sites with large pages pretty much stops. In a different browser, Google works just fine at this time.

If I plug in the ethernet cable, everything works fine, e.g. all the sites I try to reach are really up.

If I run the old laptop using its wireless, it too works just fine. If I connect to a neighbors (unprotected) store bought AP, the new laptop works fine then. It also works just fine here in the office (though its using .g for this post.)

The issue seems to be something between the laptop and my prisim card. I'm looking for knobs to tweak.

Does anyone have any idea what to look at?

For the archives...

My performance improved drastically after following the advice in this thread Wireless connectivity, XPS M1330 with Intel 4965 Mini Card - Notebook Forums and Laptop Discussion

In my case I'm using XP, but it seems like 802.11b performance (or not) depends on the right Dell/Intel driver. This driver may be an earlier version (i.e. downgrade, see thread above for details)