The lazy files' owner fetches every frame of the site's rest bundles it does not hold yet, one at a
time at fetch priority low, into the store reads look in (the page's cache for a bundle with a hash,
the kept frames otherwise). A read's own fetch goes first: none of the background's starts while one
is in flight, and a frame both want is one request. Paused while the page is hidden; none on a
save-data or 2G connection; ?restahead=0 turns it off.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_e0aa53aa95eb4b86910519b4d14812a5
