How to use
- Copy the installation command and review the source package before installing it in your own agent environment.
- Check the source document for required tools, credentials and supported hosts.
- Describe your input and desired deliverable; review the output against the source material.
npx skills add https://github.com/cap-go/capgo-skills --skill capacitor-performanceBefore you start
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Original skill document
Rendered from the source repository. Headings, examples, code, tables, links, and referenced images are preserved.
Performance Optimization for Capacitor
Make your Capacitor apps fast and responsive.
When to Use This Skill
- User has slow app
- User wants to optimize
- User has memory issues
- User needs profiling
- User has janky animations
Quick Wins
1. Lazy Load Plugins
typescript
// BAD - All plugins loaded at startup
import { Camera } from '@capacitor/camera';
import { Filesystem } from '@capacitor/filesystem';
import { Geolocation } from '@capacitor/geolocation';
// GOOD - Load when needed
async function takePhoto() {
const { Camera } = await import('@capacitor/camera');
return Camera.getPhoto({ quality: 90 });
}2. Reduce Bundle Size
bash
# Analyze bundle
npx vite-bundle-visualizer
# Tree-shake imports
import { specific } from 'large-library'; // Good
import * as everything from 'large-library'; // Bad3. Optimize Images
typescript
// Use appropriate quality
const photo = await Camera.getPhoto({
quality: 80, // Not 100
width: 1024, // Limit size
resultType: CameraResultType.Uri, // Not Base64
});
// Lazy load images
<img loading="lazy" src={url} />4. Minimize Bridge Calls
typescript
// BAD - Multiple bridge calls
for (const item of items) {
await Storage.set({ key: item.id, value: item.data });
}
// GOOD - Single call with batch
await Storage.set({
key: 'items',
value: JSON.stringify(items),
});Rendering Performance
Use CSS Transforms
css
/* GPU accelerated */
.animated {
transform: translateX(100px);
will-change: transform;
}
/* Avoid - triggers layout */
.animated {
left: 100px;
}Virtual Scrolling
typescript
// Use virtual list for long lists
import { VirtualScroller } from 'your-framework';
<VirtualScroller
items={items}
itemHeight={60}
renderItem={(item) => <ListItem item={item} />}
/>Debounce Events
typescript
import { debounce } from 'lodash-es';
const handleScroll = debounce((e) => {
// Handle scroll
}, 16); // ~60fpsMemory Management
Cleanup Listeners
typescript
import { App } from '@capacitor/app';
// Store listener handle
const handle = await App.addListener('appStateChange', callback);
// Cleanup on unmount
onUnmount(() => {
handle.remove();
});Avoid Memory Leaks
typescript
// Clear large data when done
let largeData = await fetchLargeData();
processData(largeData);
largeData = null; // Allow GCProfiling
Chrome DevTools
- Connect via chrome://inspect
- Performance tab > Record
- Analyze flame chart
Xcode Instruments
- Product > Profile
- Choose Time Profiler
- Analyze hot paths
Android Profiler
- View > Tool Windows > Profiler
- Select CPU/Memory/Network
- Record and analyze
Metrics to Track
| Metric | Target |
|---|---|
| First Paint | < 1s |
| Time to Interactive | < 3s |
| Frame Rate | 60fps |
| Memory | Stable, no growth |
| Bundle Size | < 500KB gzipped |
Resources
- Chrome DevTools: https://developer.chrome.com/docs/devtools
- Xcode Instruments: https://developer.apple.com/instruments
