react-native-performance

import performance, { PerformanceObserver, setResourceLoggingEnabled } from 'react-native-performance'; // Enable resource logging early in your app lifecycle if needed setResourceLoggingEnabled(true); // Observe performance measures and resources const perfObserver = new PerformanceObserver((list) => { list.getEntries().forEach((entry) => { console.log(`[PerfEntry] ${entry.entryType}: ${entry.name} took ${entry.duration.toFixed(2)}ms`); if (entry.entryType === 'resource') { console.log(` - URL: ${entry.name}, Transfer Size: ${entry.transferSize} bytes`); } }); }); perfObserver.observe({ entryTypes: ['measure', 'resource', 'metric'], buffered: true }); async function simulateOperation() { performance.mark('opStart', { detail: { type: 'apiCall', screen: 'home' } }); console.log('Fetching data...'); try { const response = await fetch('https://jsonplaceholder.typicode.com/todos/1'); const data = await response.json(); console.log('Data fetched:', data.title); performance.mark('opEnd'); performance.measure('fetchDataOperation', 'opStart', 'opEnd', { detail: { status: 'success' } }); } catch (error) { console.error('Fetch failed:', error); performance.mark('opEnd'); performance.measure('fetchDataOperation', 'opStart', 'opEnd', { detail: { status: 'failed', error: String(error) } }); } performance.metric('customMetricExample', Math.floor(Math.random() * 100)); } simulateOperation(); // Example of converting performance timestamp to Unix epoch (optional) // const timestamp = Date.now() - performance.timeOrigin + performance.now(); // console.log(`Current Unix epoch from performance: ${timestamp}`);