What is First Input Delay?
Read OriginalThis article explains the First Input Delay (FID) metric, a core web performance measurement. It describes FID as the delay between a user's first interaction and the browser's response, contrasting it with other metrics like FCP and TTI. It also analyzes common causes of poor FID, such as heavy JavaScript execution, and discusses its impact on different application architectures like client-rendered vs. server-rendered SPAs.
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