I'm streaming the Euro cup on my PC and my pb from the same link and both on WIFI.
my playbook tends to consistently lag on this stream whereas my PC has no issue (I have a fast connection 10mb down/10mb up) I have stopped my PC from streaming and just letting the PB stream same issue.
its either your ISP or the site you are streaming from is super busy which is most probably the case. you'll probably find alot of buffering which is 100% network related.
Most residential connections do not offer quality of service (QoS). You need ample bandwidth and guaranteed packet delivery if you expect perfect streaming across the network
sorry missed the part where streaming from your PC is fine. maybe something to do with the codec on the playbook? should be enough horsepower on the PB otherwise