It’s unfortunate that, under this proposal, one may end up splitting an application into multiple iframes to get “enough” budget (or, somewhat more nasty, an em

It’s unfortunate that, under this proposal, one may end up splitting an application into multiple iframes to get “enough” budget (or, somewhat more nasty, an embedded iframe could decide to add a second internal iframe). I could imagine an <iframe allow-slow-performance-shares=33%>, and leaving the iframe to figure out how to subdivide this among itself and its children. (And something similar for the main document.) Deploying this will be hard, since the slowest devices also tend to run outdated browsers (and thus won’t enforce limits anytime soon.)