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Wrap rehype-katex with a per-equation LRU cache (keyed by displayMode + source text) and re-enable math during streaming. Stock @streamdown/math runs rehype-katex on every markdown commit, so each new token re-katexes every equation in the message. For math-heavy responses (an equation derived step-by-step) that's hundreds of ms of wasted work per token and the streaming UI chokes. With memoization, each equation pays katex.renderToString exactly once; subsequent tokens re-walk the tree but hit cache for unchanged equations. The wrapper mirrors rehype-katex's semantics exactly: same class detection (language-math, math-inline, math-display), same <pre>-walk-up for fenced math blocks, same parent.children.splice replacement, same SKIP traversal, same strict-then-lenient render strategy with VFile message reporting. Cached children are structuredCloned on each splice so downstream rehype plugins or toJsxRuntime can't mutate the cache. |
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