I have a Buffalo WHR-HP-G54, running DD-WRT firmware (DD-WRT v24-sp1 (07/26/08) std - build 9994) and noticed that my Dell Latitude e6400 had a low wireless speed, even with a strong signal strength. I would connect to my wireless network at 54mbps, and it would fall down to 36mbps, 10mbps and finally 1mbps. After some checking around, I was able to determine the settings that needed changing to fix the issue.
In the Wireless>Advanced Settings tab
TX Antenna: Left
RX Antenna: Left
Sensitivity Range (ACK Timing) : 0
After that, reboot the router and everything should be working fine. I now stay connected at 54mbps with my laptop.
The Dell has an Intel WiFi Link 5100 AGN card installed.
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