The BT Sport online player uses adaptive streaming technology to give you the best picture quality possible for your broadband speed. The minimum speed you need to use the online player is 400KB. But ideally you'll have a speed of 3.5MB or more.
If the picture quality's not great, please check your internet connection. If you’re using BT Broadband at home, click here to check your broadband speed >
If you're using another wi-fi connection, check you've entered the correct log-in details and that your session hasn't expired. The rules for speed are the same.