Limit amount of clip thumbnails to 2 per second
@jeff
Submitted by Jeff F.T. Assigned to Jeff F.T. @jeff
Description
A significant performance problem with timeline thumbnails occurs when you zoom in a lot: thumbnails are generated "as much/many as possible" to fill the clip space, even if you're zoomed far enough to see individual frames in the ruler.
This causes a performance problem since it does too much work. It generates an almost infinite amount of thumbnails.
I think it would make more sense that it limits the thumbnails to a maximum of 1 every 500ms. We don't need that much precision, scene visuals don't change that much in half a second, typically.
Imported from https://bugzilla.gnome.org/show_bug.cgi?id=633644