Sub second

Written by Joshua Nelson, a developer who wants to make the web faster for everyone.

Get emails from me about once a month when I post new content, focusing on performance, front end technology, and engineering.

Person standing next to a giant email

See my projects

I create projects for learning and fun. Check them out.


The dangers of Apdex

April 02, 2019New post

Apdex is a universal measurement of performance, but don't be fooled into thinking that's enough.

Protecting performance

March 10, 2019

Performance is a problem. The evidence is clear – performance affects your business goals, your user’s happiness, and it impacts areas with poor connectivity even more than you might expect.

Choosing a metric

March 10, 2019

Performance is important. We need to choose the right metric to measure it.

Measuring performance

March 10, 2019

Performance is a problem. The evidence is clear – performance affects your business goals, your user’s happiness, and it impacts areas with poor connectivity even more than you might expect.

The case for performance

March 10, 2019

The median page load time for a website on a mobile device is 15.6 seconds.