Setting up an Android phone as a WebPageTest agent

Pixel 2 connected to a raspberry pi

Running detailed website performance tests is often necessary to understand how a website is experienced by an end user in order to identify opportunities for improvements.

WebPageTest.org gives us the ability to run these tests from all over the world – the public instance even gives us access to real devices, so we can check how a site works across different browsers on different versions of different operating systems on different real devices!

In my previous articles I explained how to easily set up your very own private, autoscaling, WebPageTest server. This private instance creates test agents in AWS, dotted around AWS regions, which can emulate a mobile browser; this uses the device emulation in Chrome to throttle network, CPU, memory, etc and change the available screen size.

While this mobile emulation is simple to set up and use, sometimes an emulator isn’t enough; device-specific edge cases, operating system limitations, and performance on a real device may need to be validated to get confidence that everything works as expected in the real world.

In this article I’ll show you how to set up an Android phone as your own WebPageTest agent to connect to your private WebPageTest server, controlled by a Raspberry Pi!

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Customized WebPageTest Lighthouse Results using a Custom Test Agent

In my recent article Eco Worriers: Saving the Planet, One Unoptimized Website at a Time for the fantastic annual Perf Planet advent calendar, I mentioned how I created a Private WebPageTest setup to use my own custom test agents, which were configured to use an extra Lighthouse plugin (The Green Web Foundation’s "greenhouse").

In this article I’ll show how to create custom WebPageTest agents, and how to configure your Private WebPageTest instance to use these instead of the default test agents.

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Automating WebPageTest using the nodejs webpagetest-api package

WebPageTest-api NodeJS

Hopefully you’ve already had a chance to play around with the amazing WebPageTest during your website performance testing adventure so far.

In case not, I have a few articles you might like to browse, to help you get up to speed using this fantastic, free, open source, website performance testing tool.

It has a website interface and also an API, which I went through in the previous article.

In this article I’ll show you how to use the incredible webpagetest-api nodejs package to make the orchestration and automation of your WebPageTest setup even easier!

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Automating WebPageTest via the WebPageTest API

webpagetest robots

WebPageTest is incredible. It allows us to visit a web page, enter a few values and then produce performance results from any destination around the world. Best of all, you can do this in many different possible browser configurations; even on many different real devices.

If you’re doing this a lot, then using that simple web form can become the bottleneck to rapidly iterating on your web performance improvements.

In this article I’ll show you how to easily execute your web performance tests in a simple, repeatable, automated way using the WebPageTest API.

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A Step by Step Guide to using Terraform to define an AutoScaling Private WebPageTest instance in code

WebPagetest Terraform

In a previous article I went through the steps needed to create your own private, autoscaling, WebPageTest setup in Amazon AWS. It wasn’t particularly complicated, but it was quite manual; I don’t like pointing and clicking in a GUI since I can’t easily put it in version control and run it again and again on demand.

Fortunately, whatever you create within AWS can be described using a language called CloudFormation which allows you to define your infrastructure as code.

Unfortunately it’s not easy to understand (in my opinion!) and I could never quite get my head around it, which annoyed me no end.

In this article I’ll show you how to use Terraform to define your private autoscaling WebPageTest setup in easily understandable infrastructure as code, enabling an effortless and reproducable web performance testing setup, which you can then fearlessly edit and improve!

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A Step by Step Guide to setting up an AutoScaling Private WebPageTest instance

If you have any interest in website performance optimisation, then you have undoubtedly heard of WebPageTest. Being able to test your websites from all over the world, on every major browser, on different operating systems, and even on physical mobile devices, is the greatest ever addition to a web performance engineer’s toolbox.

One small shelf of Pat Meenan's epic WebPageTest device lab

The sheer scale of WebPageTest, with test agents literally global (even in China!), of course means that queues for the popular locations can get quite long – not great when you’re in the middle of a performance debug session and need answers FAST!

Also since these test agents query your website from the public internet they won’t be able to hit internal systems – for example pre-production or QA, or even just a corporate intranet that isn’t accessible outside of a certain network.

In this article I’ll show you how to set up your very own private instance of WebPageTest in Amazon AWS with autoscaling test agents to keep costs down

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