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"Tech-savvy Computer Engineer with a passion for ML, NLP, and cloud solutions. AWS explorer and Full Stack problem solver—always up for a new tech challenge, one line of code at a time!"
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As a developer who has spent years optimizing databases for high-traffic applications, I’ve seen a recurring pattern: traditional relational databases struggle once real scale hits. Vertical scaling b
Most developers approach React the wrong way. And, with the evolution of tools that automatically generate code, the learning approach is shrinking day after day. They focus on mastering components, h
If you’ve ever been confused between OAuth and JWT, you’re not alone. Many developers mix them up because they often appear together in modern applications. But here’s the truth: OAuth is not JWT, and JWT is not OAuth. They are different, but they wo...
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When users start noticing problems…
❓ Why does my site's First Contentful Paint (FCP) take 5 seconds on a phone?
❓ Why does scrolling feel slow or choppy?
❓ Why does the app crash after some use?
❓ Why does changing one thing refresh half the page unnecessarily?
How have you solved this problem ; you being the developer of your app ?
Many developer fails as they overlook the bigger picture. It’s rare, but sometimes, even when millions of users are happily using your app, issues like slow performance, crashes, or pages not loading can suddenly appear. Performance bottlenecks aren’t always React-specific or other frontend tech-stack specific.
More often, they live in three areas:
The Build & Network
The Rendering Process
The Browser Itself
Let’s Dive more in details:
Bundling Blindness
Your bundle is massive. Why?
The code isn’t split into smaller parts.
Unused code is still included.
Images and files aren’t compressed properly.
The result? The browser has to download, parse, and execute a mountain of JavaScript before anything shows up.
Network Latency
Fast code ≠ fast app.
If your API is slow, the app feels slow.
Ask yourself: Are you making multiple calls for tiny bits of data?
Consider the following approaches:
Use REST endpoints that return everything needed at once
Implement caching to avoid repeated requests
Use pagination or lazy loading to reduce data per request
Unnecessary Re-renders
Often, the problem isn’t missing React.memo—it’s how you manage state.
Does changing a global state cause the whole app to re-render?
Could you move state closer to the components that actually need it? Putting in simple way “Prop Drilling”.
Beside the above, I’ve noticed that many developers aren’t aware of following issues, so I’ve broken them down and simplified everything as much as possible. Most don’t think about these areas, even though overlooking them can seriously hamper an application’s performance. By understanding and addressing them early, you can save time, frustration, and keep your users happy.
The Browser Itself
Not all browsers handle JavaScript the same way. An app that runs smoothly in Chrome might lag or freeze in Safari or Firefox, especially during heavy calculations or complex UI updates.
💡 Solution: Test your app across browsers, optimize performance, and use tools like Web Workers for heavy tasks so every user gets a smooth experience.
Memory Leaks
Sometimes your app keeps holding onto things it doesn’t need: Unsubscribed event listeners, forgotten timers, or unmanaged state.
Memory usage climbs… until your app crashes.
👉 Tools you should always have in your workflow:
Chrome DevTools Performance tab
Lighthouse audits
Network request analysis
Performance issues in frontend apps can come from many places. But, frontend performance isn’t just about writing fast code—it’s about the whole environment your app runs in.
✅ Audit your bundles to remove unused code.
✅ Optimize your APIs to reduce latency.
✅ Manage state smartly to avoid unnecessary re-renders.
✅ Profile memory usage to prevent leaks.
✅ Test across browsers to handle different behaviors.
Because Frontend Performance isn’t just code—it’s the ecosystem around it.