WNDR3400v3 Extremely low upload speed

Must be a bad hair day.  :smileytongue:  Sorry, couldn't resist.

A slow upload speed indicates that there is congestion somewhere in the network.  The trick is figuring out where it is.

First, make sure no one else in your household is hogging the Internet.  Someone could be streaming a video or uploading a bunch of pictures, etc.

Second, try performing a traceroute.  A traceroute will report roundtrip times along a network path.  If you are Windows, open a Command Prompt and run tracert google.com.  On a Mac, traceroute google.com.  Or traceroute to a website that seems really slow.

Each line printed by the trace is a hop in the network and the roundtrip time, in milliseconds, to that hop.  The first hop will be your WNDR3400v3 and the second hop may or may not be your modem.  All subsequent hops will be in the ISP or Internet itself.  The goal is to determine where the roundtrip times jump significantly.  If the jump occurs at the first or second hop, then bottleneck is probably in your home.  If it's anywhere else, then it's either the ISP or Internet.  If it's the ISP, you could call them up and complain.

If you think your router is the culprit, try rebooting it.  If it doesn't help and you are in a pinch, temporarily remove your router and connect your PC directly to the ISP modem.  This should, at least, allow you to work.