Question 1

How to set up a WebPageTest private instance?

Accepted Answer

Follow the installation guide in the documentation, and use the /install page on your instance to validate configuration. It involves setting up web servers, agents, and managing dependencies, which can be technical.

Question 2

WebPageTest vs Lighthouse: which is better for performance testing?

Accepted Answer

WebPageTest excels in multi-location testing, custom scripts, and detailed metrics, while Lighthouse is ideal for quick, integrated browser audits. Use WebPageTest for in-depth analysis and Lighthouse for rapid feedback.

Question 3

Can I automate WebPageTest tests in CI/CD?

Accepted Answer

Yes, using the REST API and command-line tools like /bulktest (PHP) or /batchtool (Python), you can integrate bulk performance testing into automated pipelines for continuous monitoring.

Question 4

What metrics does WebPageTest measure?

Accepted Answer

It measures Core Web Vitals such as FCP, LCP, and TBT, along with resource timing, waterfall charts, and filmstrip views, providing a holistic view of performance bottlenecks.

Question 5

How to write custom scripts for user interactions in WebPageTest?

Accepted Answer

Utilize the scripting capabilities documented in the API section to define sequences of actions. Examples in the repository show how to automate multi-step workflows for realistic testing.

Question 6

Is WebPageTest free to self-host and use?

Accepted Answer

The open-source code is free, but self-hosting requires provisioning infrastructure, managing updates, and handling maintenance, which can involve additional costs and technical effort.

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