About First Input Delay

First Input Delay is a short reference on one web performance metric: what First Input Delay (FID) measured, the thresholds Google set for it, how Interaction to Next Paint replaced it as a Core Web Vital in March 2024, and how to measure and reduce input delay today.

It exists because FID still appears in old dashboards, audits and articles, often without the date that tells you whether the advice still applies. Every date, threshold and browser version here is taken from web.dev, Chrome’s developer documentation, MDN or the relevant specification, and linked where the claim is made. Browser support changes, so each page says when it was last checked.

Who publishes this site

First Input Delay (firstinputdelay.com) is written and published by General Action, the company that makes Emdash, a product for running AI coding agents. This site is not an independent review site: it is our publication, and Emdash is our product.

How we handle recommendations

• Wherever Emdash is recommended, it is labelled as our own product. We say what it is good for and where another tool is the better choice.
• Other products are described from their public documentation and pricing pages. We are not paid to mention them and we do not use affiliate links.
• Product details change. Each page shows the date it was last updated; check the vendor's own site before you rely on a price or a plan limit.
• We do not publish ratings, scores or test results unless the page explains how they were produced.

Corrections

If something here is wrong or out of date, tell us through General Action and we will fix it.