Diagnosing white screen (but not of death!) on new page loads

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I am trying to figure out what’s going on with my WP site. On each page load (refreshing the page, clicking through to a new link), the favicon will spin as things are loading, then users are served a white screen for about 2000ms, and then the page will pop up, like instead of paint it’s showing a blank page instead.

Some things I’ve figured out:
Used the site health plugin to determine it’s something happening with the custom theme we’re using. Doesn’t appear to be a plugin.
Ran a dev console performance recording, but not sure what I am looking for to diagnose what’s happening.

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