- Drops the desktop test. Measured, it sorted devices by the wrong thing:
a phone on the fast path held 99% of its frame rate and was refused, a
desktop on the slow one held 73% and was allowed.
- What the cost tracks is the processing path, and Safari and Firefox take
the slow one on every platform. That is told, not enforced: the cost is
smoothness, the reason to pay it is privacy, and only the user knows
whether they would rather show the room they are sitting in.
- The first effect of a session takes a while to prepare, so its own tile
spins where its tick will go, until a frame has actually come out of the
pipeline. The promises say nothing useful about when that is: attaching
resolves in about three seconds and switching in none at all, and the
slow path then holds the page still for twelve to fifteen more. The
spinner turns by rotating, which a browser composites, so it keeps moving
through a pause that has stopped everything else.
- Copy is the exploration's and needs an owner (S3).
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>