That USB port on your router isn’t decorative.
I've got a Cisco/Linksys WRT54G2 with the latest firmware. If I connect to the Admin site, either over Ethernet or Wireless, the pages on the site are painfully slow to load. Often it'll take a minute ...
If you are having difficulties accessing the Internet through your router, you may need to modify settings in the router itself. Luckily, accessing the router settings does not rely on Internet access ...
Slow internet? Your router might be the villain, not your provider.