broadcom 4318 very slow?

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http://forums.fedoraforum.org – i've got the b43 driver and firmware installed, and the system comes up fine, but the max throughput on the wlan0 is about 100Kb/s. my laptop and iwl do about 2.5Mbps from the same location in the house. the signal is plenty strong: wlan0 IEEE 802.11bg ESSID:"sar2" Mode:Managed Frequency:2.422 GHz Access Point: 00:23:69:22:5C:00 Bit Rate=36 Mb/s Tx-Power=20 dBm Retry min limit:7 RTS thr:off Fragment thr:off Power Management:off Link Quality=61/70 Signal level=-49 dBm Noise level=-57 dBm Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0 Tx excessive retries:0 Invalid misc:0 Missed beacon:0 is this expected from the b43 driver and a bcm4318? i was hoping for much better throughput. also, i tried the broadcom-wl driver, but it doesn't seem to recognize the card. it looks like it's not supported from their site, only the 4311,12,21,22 were listed, although i see posts where other people claim they are using it with a 4318? (HowTos)