Why freezing completed Markdown blocks reduces streaming rendering work
An AI response arrives as text deltas. A Markdown renderer normally receives a document. Connecting them with render(allTextSoFar) repeatedly asks the renderer to interpret text the reader has already seen. I built react-stream-markdown to explore a different boundary: keep completed blocks on screen and re-parse the unfinished suffix. The repository is currently version 0.4.1 and MIT licensed.…
The article discusses the concept of freezing completed Markdown blocks in a streaming rendering process to reduce the workload of rendering text. Traditional Markdown renderers process the entire document repeatedly, causing a quadratic increase in parsing work as the document grows. However, by keeping finished blocks on screen and only re-parsing the unfinished suffix, the parsing work can be reduced to a sum of per-block work, which is more efficient when blocks remain short.
The implementation freezes preceding blocks once a new block starts, leaving them in the DOM but no longer participating in parsing and tree comparison. While this approach reduces parsing work, it does not eliminate all costs associated with rendering, such as layout and garbage collection.
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