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1baea21cfb
The chunk split only helps if nothing on the entry graph statically imports the heavy libs. Three seams did: - react-shiki: now behind one lazy() boundary (shiki-block.tsx is its only static importer; LazyShiki wraps it with a PlainCode fallback). - diff-lines.tsx: useShikiHighlighter hook extracted to a lazily-loaded syntax-diff.tsx (plain DiffBody fallback — same output Shiki's own pre-resolve state showed); codeToTokens becomes a dynamic import that runs only once a highlightable diff is on screen. - @streamdown/code: statically ran createJavaScriptRegexEngine() and built full language registries at module scope on every launch. It now loads via useCodePlugin() on first markdown mount and swaps into the plugin table when it lands; fenced code renders plain until then, identical to the delay fallback users already see during streaming. Interleaved A/B vs main (prod build, warm V8 cache, median of 4, two alternating rounds): FCP 1100->940ms, DOMContentLoaded 618->542ms, nav-to-interactive 1312->1123ms on the quiet round; same direction with larger gaps under load. ~160-190ms off every renderer boot metric. |
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