The spans put it exactly: 63.5 ms of a 63.8 ms pointer-up is
`bump_entities`, and inside it two drawing-wide scans.
`refresh_associative_centerlines` and `refresh_associative_center_marks`
each walk all 1 166 357 entities, filter to Lines and parse every one's
extended data looking for an association that references a changed
handle. About 30 ms each, run on every edit -- to find, on this drawing,
none at all.
Track whether the document holds any such association. The question is
settled once, with a single pass, and after that each edit only examines
the handles it actually changed: an entity that carries an association
flips the answer to yes, and nothing else can. Deleting the last one
leaves the answer at yes, which costs a scan that finds nothing rather
than skipping one it should have run. A coarse `bump_geometry` re-opens
the question, since it can carry a new document.
Where an association really exists the scans run exactly as before.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
