RESOLVED FIXED311672
Skip full-page anchor scan for conservative-only speculation rules 
https://bugs.webkit.org/show_bug.cgi?id=311672
Summary Skip full-page anchor scan for conservative-only speculation rules
Basuke Suzuki
Reported 2026-04-07 13:46:17 PDT
processSpeculationRules() scans ALL links on every style recalculation, performing pattern/selector evaluations per anchor. For conservative rules (eagerness: conservative), the result is only consumed at user interaction time (mousedown/pointerdown/keydown). This is wasted work on pages with many links (e.g. magnifiedsand.com with 934 links). This patch defers matching for conservative-only rules to interaction time in HTMLAnchorElement::defaultEventHandler(), skipping the full-page anchor scan in Document::processSpeculationRules() and HTMLAnchorElement::checkForSpeculationRules() when all rules are conservative.
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Basuke Suzuki
Comment 1 2026-04-07 13:55:25 PDT
<rdar://problem/173520903>
Basuke Suzuki
Comment 2 2026-04-07 13:55:40 PDT
Pull request: https://github.com/WebKit/WebKit/pull/62216
EWS
Comment 3 2026-04-08 19:34:23 PDT
Committed 310814@main (5cf7b15948ed): <https://commits.webkit.org/310814@main> Reviewed commits have been landed. Closing PR #62216 and removing active labels.
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