Is there any way that I can check to see how much memory an app or card is using? Today I was reading Twitter updates on Tweed and when I clicked on a link I got a message saying that I had too many cards open. But I only had three: one for tweed and two for web pages. So I closed one of the web pages but it still didn't work. Finally I had to close both pages so that Tweed was the only card open and then it worked. But I've definitely had more than 3 cards open at the same time so I'm not sure what was going on.