Performance metrics collection in Selenium Python - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the purpose of collecting performance metrics in Selenium tests?

Performance metrics help measure how fast and efficiently a web page or application loads and runs during automated tests.

beginner

Which Selenium method allows you to access browser performance data?

You can use the execute_script method to run JavaScript that accesses the browser's window.performance API.

intermediate

Name two common performance metrics you can collect from the browser's performance API.

Two common metrics are navigationStart (when navigation started) and loadEventEnd (when page load finished).

intermediate

How can you measure page load time using Selenium and performance timing?

By subtracting navigationStart from loadEventEnd using JavaScript executed in Selenium, you get the total page load time in milliseconds.

beginner

Why is it important to collect performance metrics during automated testing?

Collecting metrics helps identify slow parts of a website, improve user experience, and ensure the app meets speed requirements.

Which Selenium method is used to run JavaScript for performance data?

A click

B find_element

C execute_script

D get

The execute_script method runs JavaScript in the browser context, allowing access to performance data.

What does the performance timing property navigationStart represent?

A When the page finished loading

B When navigation to the page started

C When the first byte was received

D When the DOM was fully parsed

navigationStart marks the time when the browser started navigating to the page.

How do you calculate total page load time from performance timing?

A domComplete - domLoading

B navigationStart - loadEventEnd

C responseEnd - requestStart

D loadEventEnd - navigationStart

Subtracting navigationStart from loadEventEnd gives the total page load time.

Why collect performance metrics during Selenium tests?

A To measure page speed and responsiveness

B To check page content correctness

C To find broken links

D To test user login

Performance metrics help measure how fast and responsive the page is during tests.

Which API provides performance timing data in the browser?

A window.performance

B document.cookie

C navigator.geolocation

D window.localStorage

window.performance API gives access to detailed timing data about page load.

Explain how to collect and calculate page load time using Selenium and browser performance API.

Think about running JavaScript inside Selenium to get timing data.

Why is monitoring performance metrics important in automated web testing?

Consider how speed affects users and quality.