I think its just the HTML5 performance of the TV for one thing. I have the TV hardwired into a wireless bridge and I know I am getting my full 175Mbps down on that bridge because I hooked my PC up to it to test it. But here is an example of some testing I just did:
Speedtest.net (TV / HTML5 version): ~20Mbps
Netflix speedtest (TV): ~30Mbps
Speedtest.net (PC / HTML5 version): Not even working now
Speedtest.net (PC / flash version): ~175Mbps
SpeedOfMe (PC): ~125Mbps
SpeedOfMe (TV): fails
OpenSpeedTest (PC): ~175Mbps
OpenSpeedTest (TV): ~70Mbps
PC hooked to wireless bridge (same as TV): ~175Mbps
iPhone SpeedTest app: ~175Mbps everywhere in the house
The speedtest.net (flash) test gives me 175Mbps no matter when I try it, etc. Same number every time.
Like I said, all over the place
. BTW, like I said above, my TV is wired into a high-end bridge, so I am not using the TVs Wi-Fi.
Can you guys see if OpenSpeedTest works for you guys?