802.11b is now utterly obsolete and must now be disabled by all access points, routers, and clients.
802.11b first emerged in 1999 - a hot new standard that provided inexpensive networking over the air. But by January 2003, a newer, even faster standard became commonplace - 802.11g. And since then, an even faster and more efficient standard - 802.11n has been on the scene.
802.11b is inefficient, and it slows down 802.11g and 802.11n networking due to protocol limitations. And therefore, I proclaim that 802.11b must be immediately banned from the world. Doing so will speed access for everyone.
So log into your access points and disable the mixed modes that support 802.11b. Throw out your old 802.11b-only interface cards and routers. You, and 99.99% of the rest of the world will see much better performance, and you'll be convincing the 0.01% of the world - those with 802.11b clients - to upgrade.
Upgrades are very inexpensive: 802.11n USB client interfaces are available for under $15, and 802.11n routers can be had for less than $25. At this point, there is simply no reason to have 802.11b around. While we're at it, we might as well push for the end of 802.11g too.