When both 802.11b and 802.11g clients are connected to an 802.11g router, the performance of the 802.11g clients can suffer. In the worst case, all 802.11g clients will slow down to have the same network speed as the 802.11b clients. More typically the 802.11g clients experience some degradation in performance, but they still perform noticeably faster than their 802.11b counterparts.