First you need to change default firmware (example to Tomato or DD-Wrt). Valid clock frequencies for WRT54GL - 200(default), 206, 212, 216, 217, 225, 238, 240, 250Mhz. nvram set clkfreq=240 nvram commit reboot
240Mhz = +20% . *Only on LAN connection observe difference. If you use only wi-fi connection nothing improved.
