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What is Long Task Time?
What is Long Task Time?

What is Long Task Time?

By Duane Dorch ()

Long tasks are javascript code that take more than 50ms to execute, making the page unresponsive to user input. Watch to learn more about why it is important, how to measure it and how to improve it for a better user experience!
Watch on youtube.com →

What is Cumulative Layout Shift?
How To Create mPulse Custom Dashboards
Nic Jansma
Nic Jansma

Beaconing In Practice

By Nic Jansma ()

This article will look at several strategies for reliably exfiltrating telemetry — aka beaconing. We will cover when and how to send beacons, and gotchas you should watch out for.
Read More on nicj.net →

Nic Jansma
Nic Jansma

Cumulative Layout Shift in the Real World

By Nic Jansma ()

This article will review real world Cumulative Layout Shift data, taken by analyzing billions of individual page load experiences collected via Akamai mPulse's RUM performance analytics. It is written from the point of view of an author of Boomerang and an employee working on mPulse, which measures CLS via the Boomerang JavaScript RUM library.
Read More on nicj.net →

Nic Jansma
Nic Jansma

Cumulative Layout Shift in Practice

By Nic Jansma ()

Cumulative Layout Shift (CLS) is a user experience metric that measures how unstable content is for your visitors. Layout shifts occur when page content moves after being presented to the user. These unexpected shifts can lead to a frustrating visual and user experience, such as misplaced clicks or rendered content being scrolled out of view.
Read More on nicj.net →

Using mPulse in DevOps and with Jenkins
mPulse Aggregate Resource Waterfall Dashboard Overview
Creating mPulse Custom Dashboards
Tim Vereecke
How To Create mPulse Custom Dashboards
Nic Jansma
Nic Jansma

Boomerang Performance Update

By Nic Jansma ()

Two years ago, we performed an audit of Boomerang's performance, to help communicate the “cost” of including Boomerang on a page as a third-party script. In doing the audit, we found several areas of code that we wanted to improve, and have been working steadily to make it better for our customers. This article highlights some of the improvements we've made in the last two years, and what we still want to work on next!
Read More on nicj.net →

Nic Jansma
Nic Jansma

Side Effects of Boomerang's JavaScript Error Tracking

By Nic Jansma ()

When JavaScript Error Tracking is enabled for Boomerang, it can provide real-time telemetry (analytics) on the health of your application. However, due to the way Boomerang gathers important details about each error (e.g. the full message and stack), it might be incorrectly blamed for causing errors, or as the culprit for high CPU usage.
Read More on nicj.net →

Charles Vazac
Charles Vazac

Server Timing

By Charles Vazac ()

Server-Timing, the newest of the *-Timing web performance APIs, provides a mechanism for developers to supplement the navigation and resource performance entries with timing data collected on the server.
Read More on calendar.perfplanet.com →

Philip Tellis
Tim Vereecke
Tim Vereecke

data-s(h)aver strategies

By Tim Vereecke ()

More and more people are making use of the data saver mode built into their browser (Opera Turbo, Yandex Turbo Mode, Chrome Data Saver). As website owners we should listen and serve a lightweight version when the data-saver request header is present.
Read More on calendar.perfplanet.com →

When Third Parties Stop Being Polite and Start Getting Real
Nic Jansma
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