Performance metrics via DevTools in Selenium Java - Cheat Sheet & Quick Revision

Recall & Review

beginner

What are performance metrics in web testing?

Performance metrics are measurements that show how fast and efficiently a web page or application loads and runs. They help identify slow parts and improve user experience.

beginner

How does Chrome DevTools help in performance testing?

Chrome DevTools provides tools to record and analyze page load times, CPU usage, memory, and network activity. It helps testers find bottlenecks and optimize performance.

intermediate

What is the role of Selenium with DevTools Protocol in performance testing?

Selenium can connect to Chrome DevTools Protocol to capture performance data during automated tests. This allows testers to measure metrics like page load time programmatically.

beginner

Name two key performance metrics you can get from DevTools.

Two key metrics are: 1) Time to First Byte (TTFB) - how fast the server responds, and 2) DOMContentLoaded - when the page structure is ready.

intermediate

Why is it important to automate performance metric collection?

Automating performance metric collection saves time, ensures consistency, and helps catch performance issues early during development or regression testing.

Which tool allows you to capture performance metrics during Selenium tests?

A JUnit

B Chrome DevTools Protocol

C Postman

D Git

Chrome DevTools Protocol integrates with Selenium to capture performance data during tests.

What does the metric 'Time to First Byte' measure?

A Time to execute JavaScript

B Time to load all images

C Time to render CSS

D Time until the first byte is received from the server

TTFB measures how quickly the server responds with the first byte of data.

Which Selenium feature is used to access DevTools performance metrics?

A WebDriverWait

B Actions class

C ChromeDriver with DevTools Protocol

D PageFactory

ChromeDriver supports DevTools Protocol to access performance metrics.

Why should performance metrics be collected during automated tests?

A To detect performance issues early and consistently

B To increase test execution time

C To avoid writing test scripts

D To reduce browser compatibility

Collecting metrics during tests helps find performance problems early and reliably.

Which of these is NOT a typical performance metric from DevTools?

A Number of test cases

B Memory consumption

C CPU usage

D Network activity

Number of test cases is unrelated to performance metrics.

Explain how Selenium integrates with Chrome DevTools Protocol to collect performance metrics.

Think about how Selenium controls the browser and talks to DevTools.

List and describe three important performance metrics you can monitor using DevTools.

Focus on metrics that show how fast the page loads and becomes interactive.