Goal: give large amount of bandwidth, overall, across origins, exclusively only to requests blocking a rendering phase the active loading tab is at. The phases are yet to be determined exactly. A phase example: before-first-paint, before-onload. Question here is how to label the channel. I'm afraid out priority strategies on channels are more "relative" than "absolute" to be safely and easily used. Marking should be more explicit. Probably adding aliases for current priority levels to make it more clear which priority to use for what would do.

So far we haven't found any other intermediate phase breakers that would be worth. There are plans to move some loads after the page load or some time after the page load start. That is sufficient for the overall CDP goal.