How I Optimized My Flutter App’s Performance by 40% — By Bayajit Islam

When my Flutter app started lagging, I decided to fix it — not just patch it.

Here’s how I improved the performance by around 40% 👇

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🧠 1. Found Rebuild Issues in DevTools

Using Flutter DevTools, I noticed some widgets rebuilding too often.

✅ Fixed it by adding const keywords and breaking large UIs into smaller stateless widgets.

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⚡ 2. Switched to ListView.builder

Static Column → ListView.builder() = smoother scrolling.

Even for small lists, .builder() matters.

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💾 3. Cached Images

Replaced Image.network() with CachedNetworkImage.

Instant load when navigating between screens!

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🧩 4. Used ValueNotifier Instead of setState

For small UI updates, ValueNotifier + ValueListenableBuilder keeps rebuilds minimal and performance high.

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🔄 5. Fewer Animations, More Speed

Cut unnecessary animations and used Lottie only where it added value.

Less GPU load = smoother UX.

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📊 Result

• Rebuilds ↓ 40%
• Memory ↓ 30%
• Smoother frame rendering ✨

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Performance isn’t just about numbers — it’s about how the app feels.

Little tweaks make a big difference.

I’m Bayajit Islam, a Flutter frontend developer focused on fast, clean, and modern UI.

Let’s connect on LinkedIn, GitHub, Facebook, or Instagram.`

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