I have seen the Page speed for the web https://pagespeed.web.dev/ I want to calculate the amount of time taken between the user lands on the screen until the app completes processing and rendering the content. Have tried some analytics tools such as Firebase performance, Posthog, Mixpanel, Google Analytics, and Instabug. But no tool provided the analytics which I am looking for.

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(Disclosure: engineer at PostHog)