Performance is a core part of the user experience on the web. When performance is poor, users don’t convert as often.
There are many ways to quantify web performance but the principle remains the same. First you measure to get a baseline, then analyze the results and then attempt to fix it. This cycle can repeat until you have a new baseline that you are happy with.
The most important thing is to measure what actually matters to users. I am going to show you how to analyze and improve slow running JavaScript code. …
