The Scripts You Didn't Write Are Slowing Down Your App

<p>Every performance article on Dev.to quotes the same two stats. You know them. Amazon. Walmart. The 100ms one. Everyone has seen them.</p> <p>Nobody measures what their own

<h2> Why Website Speed Is More Important Than Ever in 2026 </h2> <p>Website speed has always mattered for user experience, but in 2026 it matters for an additional reason:

<p>How to Find and Fix 7 Hidden Performance Bottlenecks in Your JavaScript Code</p> <p>Running a slow web app? The culprit is almost never what you think. After profiling 300+

<p>In March 2024, Google replaced First Input Delay with Interaction to Next Paint as an official Core Web Vital. FID is gone. INP is what matters now — and most React apps that

<p>A web app can be technically fast and still <em>feel slow</em> to users.</p> <p>You might have:</p> <ul> <li>fast APIs</li> <li>optimized React components</li> <li>small bundle

<p>Thinking back to my first real frontend job still stings.</p> <p>I wasn't a total coding newbie—I had a CS degree and plenty of full-stack school projects. But professional

<p>I have a bad habit with performance work. I open Lighthouse, see a red number, and start fixing whatever the report lists first. Usually that's an image that's 40KB too big. It

<p>In Q3 2025, our 14-person frontend team stared down a 3.2MB initial bundle for our Angular 18 enterprise resource planning (ERP) app — a figure that triggered 4.7s first