At least for ads, we want to be fairly ruthless about keeping SWFs from causing jank. Instead of waiting the usual 10 seconds and then showing a slow-script dialog, we can just kill the offending player instance. Because the player lives in a different compartment from the GFX part, that would keep a snapshot of the last successfully rendered frame around. I think it would make a lot of sense to permit substantially less time under ExternalInterface calls, because those directly cause jank in the (html) content process. Perhaps limiting that to 1500ms or so would be just fine. Other script could be given more leniency, maybe even up to the default 10 seconds, but probably less.

Till says this bug doesn't need to block our M3 milestone.