KaneAI - World’s First E2E Software Testing Agent.Signup for Private Beta Join TestMu Conference

How to use emulateCPUThrottling method in Puppeteer

Best JavaScript code snippet using puppeteer

index.js

Source:index.js

...32    var res = [];33    for (i = 0; i < iterazioni; i++) {34        const page = await browser.newPage();35        await page.emulateNetworkConditions(avgFixed)36        await page.emulateCPUThrottling(argv.cpu || 1);37        page.setCacheEnabled(false);38        if (argv.nexus == true) {39            await page.emulate(nexus);40        } else {41            await page.setViewport({42                width: argv.w || 1920,43                height: argv.h || 1080,44                deviceScaleFactor: 1,45                isMobile: argv.mobile || false,46            });47        }48        page.on('console', function(msg) { try { log.push(JSON.parse(msg.text())); } catch {49                (argv.v == true) && console.log(msg.text()) } });50        await page.goto(argv.url);...

lcp.js

Source:lcp.js

...47    const client = await page.target().createCDPSession();48    await client.send("Network.enable");49    await client.send("ServiceWorker.enable");50    // await page.emulateNetworkConditions(networkConditions["Fast 3G"]);51    // await page.emulateCPUThrottling(4);52    await page.emulate(phone);53    await page.evaluateOnNewDocument(calculateLCP);54    await page.goto(url, { waitUntil: "load", timeout: 60000 });55    const lcp = await page.evaluate(() => {56      return window.largestContentfulPaint;57    });58    browser.close();59    return lcp;60  } catch (error) {61    console.log(error);62    browser.close();63  }64}65getLCP("https://mw-production1.coach.com").then((lcp) =>...

benchmark.js

Source:benchmark.js

...4const test = async (name) => {5  const browser = await puppeteer.launch({ headless, timeout: 0 })6  const page = await browser.newPage()7  const navigationPromise = page.waitForNavigation()8  await page.emulateCPUThrottling(6)9  const root = `benchmark/${name}`10  if (!fs.existsSync(root)) {11    fs.mkdirSync(root, { recursive: true })12  }13  await page.tracing.start({ path: `${root}/tracing.json` })14  page.setDefaultNavigationTimeout(0)15  await page.goto(`http://localhost:3000/${name}`, {16    waitUntil: "load",17    timeout: 0,18  })19  await navigationPromise20  const count = 421  for (let i = 0; i < count; i++) {22    await page.type(`[name=input-${i}]`, "Hello")...

mac.wsce.config.js

Source:mac.wsce.config.js

...20                name: "CPU Throttling",21                when: "before",22                twice: false,23                run: async (_, page, __) => {24                    await page.emulateCPUThrottling(1);25                },26            },27        ],28        puppeteerOptions: { headless: true },29    },30    exporter: {31        port: 3001,32    },...

puppet.js

Source:puppet.js

...15      url: process.env.object_FULL_URL,16      name: "objecttoken",17      value: process.env.object_AUTH18  })19  await page.emulateCPUThrottling(parseInt(process.env.object_THROTTLE));20  console.log("page setup complete")21  await page.goto(process.env.object_FULL_URL);22  page.on('console', (msg) => console.log(msg.text()));...

throttle-network-cpu.js

Source:throttle-network-cpu.js

...5  const client = await page.target().createCDPSession();6  await client.send('Network.enable');7  // Simulated network throttling (Slow 3G)8  await page.emulateNetworkConditions(puppeteer.networkConditions['Slow 3G']);9  await page.emulateCPUThrottling(4);10  await browser.close();...

estimo.js

Source:estimo.js

1const estimo = require('estimo')2async function doThis() {3  const report = await estimo(['http://localhost:3000/error-boundary', 'http://localhost:3000/optional-chaining'], {4    runs: 5, emulateCpuThrottling: true,5    cpuThrottlingRate: 4,6  })7  console.log({ report });8}...

cpu-throttling.js

Source:cpu-throttling.js

...4    name: "CPU Throttling",5    when: "before",6    twice: false,7    run: async (_, page, __) => {8        await page.emulateCPUThrottling(factor);9    },10};...

Using AI Code Generation

1const puppeteer = require('puppeteer');2(async () => {3  const browser = await puppeteer.launch();4  const page = await browser.newPage();5  await page.emulateCPUThrottling(4);6  await page.screenshot({path: 'example.png'});7  await browser.close();8})();

Using AI Code Generation

1const puppeteer = require('puppeteer');2(async () => {3    const browser = await puppeteer.launch({4    });5    const page = await browser.newPage();6    await page.emulateCPUThrottling(4);7    await page.waitFor(5000);8    await browser.close();9})();

Using AI Code Generation

1const puppeteer = require('puppeteer');2const fs = require('fs');3(async () => {4  const browser = await puppeteer.launch({ headless: false });5  const page = await browser.newPage();6  await page.emulateCPUThrottling(4);7  await page.screenshot({ path: 'google.png' });8  await browser.close();9})();10const puppeteer = require('puppeteer');11const fs = require('fs');12(async () => {13  const browser = await puppeteer.launch({ headless: false });14  const page = await browser.newPage();15  await page.emulateNetworkConditions({16  });17  await page.screenshot({ path: 'google.png' });18  await browser.close();19})();20const puppeteer = require('puppeteer');21const fs = require('fs');22(async () => {23  const browser = await puppeteer.launch({ headless: false });24  const page = await browser.newPage();25  await page.emulateMedia('screen');26  await page.screenshot({ path: 'google.png' });27  await browser.close();28})();29const puppeteer = require('puppeteer');30const fs = require('fs');31(async () => {32  const browser = await puppeteer.launch({ headless: false });33  const page = await browser.newPage();34  const title = await page.evaluate(() => document.title);35  console.log(title);36  await browser.close();37})();38const puppeteer = require('puppeteer');39const fs = require('fs');40(async () => {41  const browser = await puppeteer.launch({ headless: false });42  const page = await browser.newPage();

Using AI Code Generation

1const puppeteer = require("puppeteer");2(async () => {3  const browser = await puppeteer.launch({4  });5  let pages = await browser.pages();6  let tab = pages[0];7  await tab.emulateCPUThrottling(4);8})();

Using AI Code Generation

1const puppeteer = require('puppeteer');2async function emulateCPUThrottling() {3  const browser = await puppeteer.launch({4  });5  const page = await browser.newPage();6  await page.emulate(puppeteer.devices['iPhone X']);7  await page.emulateCPUThrottling(4);8  await page.waitFor(5000);9  await browser.close();10}11emulateCPUThrottling();

Using AI Code Generation

1const puppeteer = require('puppeteer');2(async () => {3  const browser = await puppeteer.launch({headless: false, args: ['--disable-gpu', '--disable-dev-shm-usage', '--no-sandbox']});4  const page = await browser.newPage();5  const client = await page.target().createCDPSession();6  await client.send('Emulation.setCPUThrottlingRate', { rate: 4 });7  await page.screenshot({path: 'example.png'});8  await browser.close();9})();

Using AI Code Generation

1const puppeteer = require('puppeteer');2(async () => {3  const browser = await puppeteer.launch({headless: false});4  const page = await browser.newPage();5  await page.emulateCPUThrottling(4);6  await page.screenshot({path: 'google.png'});7  await browser.close();8})();9const puppeteer = require('puppeteer');10(async () => {11  const browser = await puppeteer.launch({headless: false});12  const page = await browser.newPage();13  await page.emulateNetworkConditions({14  });15  await page.screenshot({path: 'google.png'});16  await browser.close();17})();18const puppeteer = require('puppeteer');19(async () => {20  const browser = await puppeteer.launch({headless: false});21  const page = await browser.newPage();22  await page.emulateMedia('screen');23  await page.screenshot({path: 'google.png'});24  await browser.close();25})();26const puppeteer = require('puppeteer');27(async () => {28  const browser = await puppeteer.launch({headless: false});29  const page = await browser.newPage();30  await page.emulate({31    viewport: {32    },33  });34  await page.screenshot({path: 'google.png'});35  await browser.close();36})();37const puppeteer = require('puppeteer');38(async () => {39  const browser = await puppeteer.launch({headless: false});

Automation Testing Tutorials

Learn to execute automation testing from scratch with LambdaTest Learning Hub. Right from setting up the prerequisites to run your first automation test, to following best practices and diving deeper into advanced test scenarios. LambdaTest Learning Hubs compile a list of step-by-step guides to help you be proficient with different test automation frameworks i.e. Selenium, Cypress, TestNG etc.