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.
I currently have a Linksys BECW11S4 router a WUSB 11 adapter and a WPC 11 pci network card, these are to the B standard. The router is hard wired to a desk top, the usb adapter is connected wirelessly to a desk top, and the pci card is on a laptop wirelessly. All of these are working fine, but I am wanting to upgrade to the G or better parts to have more speed and to maybe increase the range of the network, to the wireless computers espically the laptop as it becomes very slow when at the outside of the range of the router. I know that I will need to replace the router to an G or faster and the pci card for the laptop to G or better but do I need to replace all of the wireless adapters if I am only really wanting to increase the speed of the laptop. I think the I had read some where the if you didn't have all of the adapters at the same speed the whole system would run at the speed of the slowest adapter. Please advise if this is true or not. I connect to the WWW with road runner at 4-5 mb/s speed.