While this lowly PC is far from the state of the art, I think it might show some of the performance problems others have noted. The first 'bump' in the CPU usage is from clicking on a link to a 1940 Census image, using the Flash viewer. The second is by clicking on the interactive viewer button while at the same image. I have most of the interactive options OFF, other than the search result highlight. HTML5 is not a performance boost, but does help with new equipment sales. Guess I need 4 CPUs.