I have no issues with the Shaw Direct VOD streaming in HD,
but then I have the Shaw Cable 50 mps internet.
You have to take in consideration just how many devices you have connected to your home network.
You can try logging off your other devices and shutting them off,when you only have 10 mps to work with your near the min for using Shaw's VOD.
You can also try reseting your modem by unplugging the power for a couple of minutes ,
it will usually will give you a better down load speed test on the VOD.