and watched the resource use. While the video was playing, the minimum CPU use from Safari was 48%, with frequent spikes above 60%. As soon as I closed the tab, CPU use dropped to about 2% and stayed there. On a laptop with a full charge and power-management profiles to optimize usage you can get away with this; on a power-constrained mobile device you most certainly can't.
http://www.youtube.com/watch?v=XsSHlCDIzNg&feature=relat...
and watched the resource use. While the video was playing, the minimum CPU use from Safari was 48%, with frequent spikes above 60%. As soon as I closed the tab, CPU use dropped to about 2% and stayed there. On a laptop with a full charge and power-management profiles to optimize usage you can get away with this; on a power-constrained mobile device you most certainly can't.