perf(landing): stop eager 2.7MB video fetch on mobile (P0, split from #296)#299
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On mobile, autoPlay was set to !prefersReducedMotion which overrides preload="none" per HTML spec, causing the full 2.7MB MP4 to download on the critical path. Gate autoPlay on !isMobile && !prefersReducedMotion so the deferred fetch actually defers on mobile. - Show poster with native controls on mobile (tap-to-play) - Skip IntersectionObserver autoplay resume on mobile - Desktop behavior unchanged (autoplay when not reduced-motion) - Add tests: mobile no-autoplay, mobile controls present
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This was referenced Jun 5, 2026
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What (P0 only — split from #296)
Mobile
VideoSectionno longer autoplays.autoPlaywas overridingpreload="none"(HTML spec), forcing eager download of the 2.7MBvoidpay-9x16-v2.mp4on the critical path. Now: poster + tap-to-play via native controls;preload="none"actually defers the fetch. Desktop autoplay + reduced-motion paths preserved. IntersectionObserver skipped on mobile.Why split
#296 bundled P0 (video) + P1 (RSC codec lift). Official PSI (mobile, 3× median) showed P1's RSC lift introduced an LCP/SI regression (pulls demo-invoice render into the critical path). P0 is a clean isolated win and ships on its own; P1 is being reworked separately.
Effect (P0 isolated)
Verification
P0 acceptance was validated by Iris on #296 (9/9 P0 criteria pass). This branch is the same VideoSection commit (987b866 → 633d288), cherry-picked clean onto develop.
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