7 Common Next.js Performance Mistakes That Have Nothing to Do With Your Server

A technical guide highlights seven client-side mistakes that commonly slow down Next.js applications before server infrastructure is ever at fault. One frequent culprit is importing entire third-party libraries when only a single utility function is needed, unnecessarily inflating bundle size. Overusing the 'use client' directive is another issue, where entire page components are client-rendered simply because one small interactive element requires it. Developers also frequently fetch data client-side via useEffect when the same data could be retrieved more efficiently on the server using Server Components. The guide urges developers to audit these patterns first, as many can be identified and resolved in under five minutes.