I am surprised too as I have no problem with any other flash based stream at HD resolution
I have been given a tip by a tech friend to try the waterfox browser as it is based on Firefox which gives the best viewing out of all the browsers but isn't as bad on resources as Firefox
I think the bottleneck is between the CPU and graphics somewhere
When I first tried the services a while back it worked ok
Which leads me to think there's a problem somewhere
I only took out a month sub but I have been toying with the ideas of messing with an old httpc I had from a few years ago and giving it a revamp and upgrade and use xmbc with it
As was initially going to use that's as it was ok playing ajs but I have found there is a hardware fault somewhere which I think I'd the motherboard ram sockets
Which is a shame as its a am2 socket board which is now getting harder to upgrade and is prob cheaper to go for a new style system