I use Xubuntu 14.04 LTS 64-bit (3.13.0-43-generic) on a low-end notebook (AMD C-70, 2GB RAM, RTL8188EE) and a router D-Link DSL-2640B.
The wireless connection looks fine, but it is impossible to use the notebook due to slowness.
I changed the video driver (opensource / AMD), but did not solve the problem.
I've tried to use a modified network driver, but the problem still persists.
Does anyone know any way to solve this problem?