One day, your JavaScript app is fast. A few hours later… it feels like it’s running through mud. 🐌 I’ve seen this happen because of something developers often ignore: memory leaks. JavaScript has a Garbage Collector, but it can’t clean memory that your app still references. Common causes? 👇 🔹 Forgotten setInterval() / setTimeout() 🔹 Event listeners that are never removed 🔹 Large objects accidentally kept in global scope 🔹 Closures holding references longer than expected 🔹 Caches that grow forever The fix usually starts with finding what is still being referenced. 🛠️ Use Chrome DevTools → Memory → take heap snapshots → compare them → find objects that keep growing. Then clean up what you no longer need: clearInterval(), removeEventListener(), unsubscribe from listeners, and limit cache sizes. The biggest lesson? Memory leaks aren't always about using too much memory. They're about failing to release memory you no longer need. 🧠 I wrote more web development content here: blog.webdevlab.org Have you ever spent hours debugging a slow JavaScript app only to discover a memory leak? 😅 #JavaScript #WebDevelopment #NodeJS #Programming #SoftwareEngineering