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perf: speculative navigation warmup + RegExp species fuse + speed-mod… - #446
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…e dial Three independent performance changes built and benchmarked on top of firefox-main @ 133570141: - SpiderMonkey: skip RegExp @@species lookups in String.split/matchAll via a new OptimizeRegExpSpeciesFuse (mirrors CanOptimizeArraySpecies): intrinsic + CacheIR stub + Warp compile dependency. Fuse pops restore the generic SpeciesConstructor path. - Urlbar: speculativeConnect on keyboard selection ('select' reason), with privacy derived from the window when no query context exists. - Hover prefetch: dom.speculation_rules.hover_prefetch_all synthesizes a moderate-eagerness PrefetchCandidate for same-origin links when the document has no rule sets, reusing the existing SpeculationRules / PrefetchRecordParent activation path. Plus a browser.speed.mode pref-bundle dial (SpeedMode.sys.mjs) and HTTPS hover-preconnect / anchor DNS prefetch defaults. Generated with [Devin](https://devin.ai) Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>
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…e dial
Three independent performance changes built and benchmarked on top of firefox-main @ 133570141:
Generated with Devin
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