My only userbox is a slightly modified version of User:C6541/userboxes/conspeed. I might make some more.

Effect Code Notes
SpeedThis users download speed is {{{1}}} kbps and upload speed is {{{2}}} kbps.
{{User:Nintend06/userbox/conspeed|downspeed|upspeed}}
Replace "downspeed" with your download speed(in kbps), and "upspeed" with your upload speed(same units as "downspeed".) Link