Is there info on how Pages renders a site in terms of (a) incremental or delta rebuilds when content

Is there info on how Pages renders a site in terms of (a) incremental or delta rebuilds when content changes but the code base is the same, and (b) when the code changes and a rebuild is triggered off a branch change? The docs on the website are tutorials, so is there anything deeper besides "read the code"? 😄
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