Hoist the loop-invariant ontology-URI lookup out of the label predicate#17
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SaxonJS does not hoist local:ontology-uri($vocab) out of the predicate in local:ontology-label, so the whole vocabulary document was rescanned once per description element - quadratic on the striped, 1400-description dcterms.rdf and ~1.4s of every editor boot spent in init-overlay. Binding the URI to a variable first makes the scan linear: init-overlay drops from ~1430ms to ~20ms, and the toolbar appears at ~0.7s instead of ~2.1s after navigation (measured headless on localhost). Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Problem
The editor toolbar appeared ~1.7s after the page content. Profiling the boot headless showed the whole gap was
init-overlay(1428 ms of the ~1.5smainexecution) — specifically building the vocabulary dropdowns from dcterms.rdf.The culprit is the predicate in
local:ontology-label:SaxonJS does not hoist the loop-invariant
local:ontology-uri($vocab)call out of the predicate, so the whole vocabulary document is rescanned once per description element — quadratic on the striped, 1400-description dcterms.rdf (foaf's 94 descriptions cost ~20 ms; dcterms' 1400 cost ~1350 ms).Fix
Bind the ontology URI to a variable before the predicate (one-line hoist, same semantics — including the empty-URI case, where the predicate is false everywhere as before).
Measured impact (headless, localhost)
init-overlayThe remaining gap to first paint is the
window.onloadwait on external fonts, not the editor.Verification
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