Seems to be too slow for me too.
Spec: 1gps, softlayer WDC. Zoom uploader
I know its not supposed to be fast but 300kbps? C'mon.
Definitely something wrong with EvoSwitch routers. US traffic is horrible, from both wupload and filesonic.
For now, wupload isolated the issue, and resolving the problem, waiting for Filesonic team to do the same.