dell wireless 1704 slow Speed (dell vostro 2420)

use this config

XPress technology :enabled

or

1) Right click on Dell Wireless 1704 -> Properties -> Advanced

- Antenna Diversity : Aux
- Bandwidth Capability : 11b/g:20/40Mhz
- Minimum Power Consumption: Disabled

2) -> Power Management
- Uncheck "Allow the computer to turn off.."

from 

https://rstforums.com/forum/64568-dell-wireless-1704-windows-8-x64.rst