- Enable styled‑components “speedy mode” in dev builds for up to 10× faster rendering (Safari read‑only CSS, requires SC_DISABLE_SPEEDY flag in custom frameworks).
- Increase default fetch concurrency from 10 to 25 and add a CLI `--max-fetch-concurrency` flag to prevent stalled validators during document validation.
- Update docs and minor UI tweaks for diff component styling and test utilities.
v3.57.0
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