Empty HTML warmup only spun up the WebContent process. The first
real article still paid ~3s for CSS parsing, font measurement,
layout engine init, and compositing pipeline startup.
Now ArticleRenderer.init loads the full ArticleHTMLBuilder template
with sample content covering all styled elements (paragraphs,
headings, blockquotes, code blocks). WebKit performs real rendering
during app launch while the user is on Home/Fitness. By the time
they open the first article, CSS is parsed, fonts are measured,
and the pipeline is warm — the first article renders as fast as
subsequent ones.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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