The Android Performance Gap
If your Adalo app feels snappy on an iPhone but sluggish on some Android phones, you're not imagining it. Adalo builds real React Native apps (not webview wrappers), but the JavaScript that drives your app still runs across a huge range of Android hardware. On lower-end and older Android devices, that shows up as longer load times, occasional janky scrolling, and more memory pressure than you'd see on a recent iPhone. Adalo 3.0 (released in late 2025) rebuilt the underlying architecture and narrowed this gap, but device fragmentation means Android is still where you'll usually feel it first.
Why Android Can Be Slower
1. Device Fragmentation
iPhones are a small, powerful set of devices. Android spans thousands of models, from flagships to budget phones with 2-3GB of RAM and older chips. Adalo's React Native runtime executes your app's JavaScript on all of them, and low-end Android hardware struggles with heavy, JavaScript-driven screens far more than a modern iPhone does.
2. Image Rendering
Image decoding is more expensive on lower-end Android devices. A list with 30 thumbnails that loads in 1.5 seconds on an iPhone 14 might take noticeably longer on a mid-range Samsung Galaxy, especially with uncompressed images.
3. Memory Management
Android's memory management is less aggressive about releasing unused resources. Adalo apps that maintain multiple screens in memory (deep navigation stacks) accumulate memory pressure faster on Android.
Android-Specific Optimization Strategies
Strategy 1: Aggressive Image Compression
Target ~100KB per image for Android (vs ~200KB for iOS). Use WebP instead of JPEG where you can - it's 25-35% smaller at equivalent quality and is natively supported on modern Android.
Strategy 2: Reduce List Items Further
If you're showing 20 items per list on iOS, drop to 10-15 for Android. The reduced rendering load has an outsized impact on mid-range Android devices.
Strategy 3: Simplify Screen Transitions
Avoid deep navigation stacks. Every screen Adalo pushes onto the stack remains in memory. After 5-6 levels of navigation, Android devices start experiencing significant lag. Use 'Back' actions that pop screens from the stack instead of pushing new copies.
Strategy 4: Test on Real Android Hardware
Don't test only on high-end Pixels or Samsungs. Your users likely have mid-range devices. Test on a device with 3GB RAM and a 2-3 year old processor to see what most Android users actually experience.
Strategy 5: Minimize Custom Components
Each custom component adds its own JavaScript. On lower-end Android devices, that extra parsing and execution is more costly than on iOS, so only reach for custom components when Adalo's native ones genuinely can't do the job.
Android-Specific Bugs to Watch For
- Shadow rendering: heavy CSS box-shadows can render slowly on some Android devices. Remove decorative shadows on list items
- Tab bar padding: Android applies different safe area insets than iOS. Test tab bar layouts on devices with software navigation buttons
- Keyboard overlap: Android keyboards can overlap input fields in Adalo forms. Report to Adalo support or use custom components with keyboard-aware positioning
When to Consider a Custom Build
If your user base is primarily Android (common in many global markets) and performance is still a problem after optimizing - and after moving to Adalo 3.0 - you may have outgrown a generated app. A hand-built app in React Native or Flutter removes the overhead of Adalo's generic runtime and can deliver meaningfully better performance on the same Android hardware.
Buildify migrates Adalo apps to native code - preserving your features while removing that runtime overhead. Get a free performance audit →
FAQ
Why is my Adalo app slow on Android but fast on iPhone?
It's usually device fragmentation, not a webview - Adalo compiles to React Native, and its JavaScript runs across a wide range of Android hardware, much of it less powerful than a recent iPhone. Compress images to ~100KB, reduce list items, and minimize custom components. Adalo 3.0 also improved baseline performance, so make sure you're on the current architecture.
Should I build for iOS or Android first with Adalo?
Build for iOS first - it's the more forgiving platform for Adalo apps. Once your app performs well on iOS, optimize for Android using the strategies above. If Android performance is still unacceptable after that, consider a custom build.