The editor watched page:getSnapshot, which Convex re-runs in full after any
write to the page: every edit re-read the whole page (58.5 KB on an
87-element page). Watch it as page:getFrame plus page:getElementSlice for
hexadecimal id ranges covering every id instead (about ten elements a
slice, 1 to 16 slices, sized from the page as last read), and put the parts
together into the same complete page answer the editor, the offline copy
and conflict handling read today. An edit then re-runs one slice: 10.7 KB
with 8 slices.

The page shows only once every part has answered. Parts answering
together, as when one write touches two slices, are put together once.
Ties in sortIndex are ordered by id, as the offline copy orders them.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>