Not just HD streaming. Also Javascript. A lot of sites are very heavy on that these days.

And if your PC isn't very powerful, especially if single core, it may well struggle with those sites. Facebook, etc.

Even on my work lappy which is a dual core about 2 years old, Firefox struggles if FB and the Rugby World Cup site are open in the same window in different tabs.

Posted By: Steve in Holland, Sep 21, 12:35:17