I experienced the same and it turns out to be a few areas of issues. One will drive you batty.
The dlink and others are often new, in the box with outdated firmware. As such, they need an update first before they work well. Same for client devices.
The second item was that surrounding clients were at 11mbps speed and the WAP was running at that old speed for the benefit of the other clients. New firmware seems to have cured that install.
The last issue is ADHOC mode. If you did that, then it runs at 11.
I recently purchased a hp laptop with an inbuilt wiress networking card. The specs say it is tri compatible a/b/g.
I have a Netgear WGT624 108Mbs Wireless Router connected to my desktop.(I have cable internet)
Now when my laptop connects to the network it only runs at 11Mbs? Why is that when it can run alot faster according to specs?
I have tried updating drivers etc but no go. There also does not appear any settings to adjust. The router firmwire is set to run at 108.
I wonder if it has something to do with the inbuilt card in laptop not being netgear?
Any help would be appreciated.