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What is synthetic testing?

Dynatrace

Synthetic testing simulates real-user behaviors within an application or service to pinpoint potential problems. Here’s a look at why this testing matters, how it works, and what companies need to get the most from this approach. What is synthetic testing? RUM, meanwhile, requires actual users.

Testing 214
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Site-Speed Topography

CSS Wizardry

When first working on a new site-speed engagement, you need to work out quickly where the slowdowns, blindspots, and inefficiencies lie. Any time you run a test with WebPageTest, you’ll get this table of different milestones and metrics. Note the bottom row shows me the Standard Deviation of the tests’ results. Gathering Data.

Speed 292
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The psychology of site speed and human happiness

Speed Curve

In the fourteen years that I've been working in the web performance industry, I've done a LOT of research, writing, and speaking about the psychology of page speed – in other words, why we crave fast, seamless online experiences. In fairness, that was in the early 2000s, and site speed was barely on anyone's radar.

Speed 133
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The Three Cs: Concatenate, Compress, Cache

CSS Wizardry

Given that 66% of all websites (and 77% of all requests ) are running HTTP/2, I will not discuss concatenation strategies for HTTP/1.1 In one test, I concatenated it all into one big file, and the other had the library split into 12 files. Read the complete test methodology. What happens when we adjust our compression strategy?

Cache 291
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What Web Designers Can Do To Speed Up Mobile Websites

Smashing Magazine

What Web Designers Can Do To Speed Up Mobile Websites. What Web Designers Can Do To Speed Up Mobile Websites. I recently wrote a blog post for a web designer client about page speed and why it matters. She understood how important mobile page speeds were to the user experience and, by proxy, SEO.

Website 110
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Fast memcpy, A System Design

ACM Sigarch

We look here at a Gedankenexperiment: move 16 bytes per cycle , addressing not just the CPU movement, but also the surrounding system design. A lesser design cannot possibly move 16 bytes per cycle. This base design can map easily onto many current chips. We finish by testing for len > 255. Thought Experiment.

Design 145
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Refactoring CSS: Strategy, Regression Testing And Maintenance (Part 2)

Smashing Magazine

Refactoring CSS: Strategy, Regression Testing And Maintenance (Part 2). Refactoring CSS: Strategy, Regression Testing And Maintenance (Part 2). These issues and challenges are specific to the codebase and can make the refactoring process or testing difficult. It is also easier to test and verify.

Strategy 132