said by SHoTTa35 :Slingbox isn't doing more than 1200Kbps...
Wrong, even my SOLO box will push more than 1200Kbps as shown in the screen shot I just took 15 minutes ago. My HD box would push twice this much over FiOS, while on Comcast I hit between 1.5 and 4 Kbps with an occasional buffering or a complete signal loss.
This never happened to me with FiOS, but it happens all of the time with Comcast now. I have to lower the quality setting if I hope to keep a steady video stream.
I hit 6Mbps on speed tests, but I can't sustain that speed with a consistent stream. I think 4 is my max. I doubt you can reach 10Mbps except for short bursts, and a solid upload stream of ~8Mbps would certainly bring your downloads to a crawl in the same manner that mine are when I max my uploads streaming my Slingbox video.