TLDR Tech / Dev
A Broken Heart
A web app dashboard mysteriously became ten times slower. When initial fixes failed, deeper investigation using Safari's performance inspector found that "Layout" was consuming 94% of the CPU time, only on Safari. A binary search process aided by Claude pinpointed the cause: a single heart emoji rendered via the "Noto Color Emoji" Google font, which suffered from extremely slow SVG rendering fallback on Apple platforms.
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