The answer
Reduce blocking CSS and JavaScript, avoid repeated DOM updates, size images correctly, and keep the critical path small.
What Happens in the Browser Before Rendering?
How do I speed up browser rendering?
More FAQs in What Happens in the Browser Before Rendering?
It parses HTML into the DOM, parses CSS into the CSSOM, runs scripts, computes layout, and then paints the page.
The browser needs CSS to know how elements should be styled before it can safely paint the page.
Synchronous scripts block HTML parsing and can delay DOM construction, which delays the rest of the rendering pipeline.
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