Strong Wireless Signal, Poor Connectivity

Hey all - the forums here are great! I hope that someone knows what this problem might be.

I have a 9100 Inspiron with the wireless a/b/g card.

Now, at work, we have a 'b' connection. Everything links up, speed and response are as expected,
all day. At home, we have a 'g' router. Laptop again, links up, 54Mbs, great. But, going online in
any browser, Explorer, Opera, etc., takes about 20 seconds before the page comes up.
It's almost like there's a bottleneck between the wireless laptop and the router.

I've changed channels, to no avail. The wired system connects without issue. And since the laptop
works great on all other 'b' networks, it leads me to believe it's the 'g' wireless card.

Any help appreciated to speed up these connection times.