AgentSkillsCN

capacitor-performance

为 Capacitor 应用提供性能优化指南,涵盖 Bundle 大小、渲染效率、内存管理、原生桥接以及性能剖析。当用户需要优化应用性能时,可使用此技能。

SKILL.md
--- frontmatter
name: capacitor-performance
description: Performance optimization guide for Capacitor apps covering bundle size, rendering, memory, native bridge, and profiling. Use this skill when users need to optimize their app performance.

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
bunx vite-bundle-visualizer

# Tree-shake imports
import { specific } from 'large-library';  // Good
import * as everything from 'large-library'; // Bad

3. 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); // ~60fps

Memory 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 GC

Profiling

Chrome DevTools

  1. Connect via chrome://inspect
  2. Performance tab > Record
  3. Analyze flame chart

Xcode Instruments

  1. Product > Profile
  2. Choose Time Profiler
  3. Analyze hot paths

Android Profiler

  1. View > Tool Windows > Profiler
  2. Select CPU/Memory/Network
  3. Record and analyze

Metrics to Track

MetricTarget
First Paint< 1s
Time to Interactive< 3s
Frame Rate60fps
MemoryStable, no growth
Bundle Size< 500KB gzipped

Resources