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Improve user experience with more visibility into CDN-related HTTP errors (Part 1) 

Dynatrace

Modern web applications rely heavily on Content Delivery Networks (CDNs) and 3rd-party integrations (for example, web analytics, tag managers, chat bots, A/B testing tools, ad providers, and more). In Part 1 we’ll dive into: The need to extend synthetic tests to cope with the CDN-error blind spot. Dynatrace news.

Tuning 185
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Search Engine Optimization Checklist (PDF)

Smashing Magazine

Implementing SEO best practice doesn’t just give you the best chance possible of ranking well in search engines; it makes your websites better by scrutinizing quality, design, accessibility, and speed, among other things. Testing And Monitoring. HTTP/2 Test Tool by Geekflare. Testing And Monitoring.

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Why Page Speed Scores can be Dangerous

MachMetrics

All of the popular speed testing tools typically provide a page speed score along with their objective results. The reality is that these scores are estimates of how well your site implements performance best practices. These best practices can make your site faster, but they don’t always.

Speed 111
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An Opinionated Guide to Performance Budgets

Speed Curve

You can then configure your monitoring tools to send you alerts – or even break the build, if you're testing in your staging environment – when your budgets are violated. For each of these metrics, I've included what type of tool you can use to track them: synthetic and/or real user monitoring (RUM). >

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Performance Game Changer: Browser Back/Forward Cache

Smashing Magazine

WebPageTest is one of the few web performance testing tools that actually tests a reload of the page using a primed HTTP Cache — most of the other tools just flag if your HTTP resources are not explicitly set to be cached. 400 pages , jam-packed with in-depth user research and best practices.

Cache 91
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Tutorial: Guide to automated SRE-driven performance engineering

Dynatrace

After a new build gets deployed and automated tests executed, SLIs are evaluated against their SLOs and, depending on that result, a build is considered good (promoted) or bad (rolled back). “ Firstly, start by installing the Dynatrace OneAgent on the hosts where you’ll be running your application test. SimpleNodeJsService.

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Email Testing Flow As It Should Be

Smashing Magazine

It is recommended to follow rules and best practices of building and sending emails. Some developers tend to use /dev/null fake SMTP server for email testing, but this is not efficient as it doesn’t imitate production. If you run tests in a production environment, be ready to reveal test data to real users.

Testing 110