Understanding Performance Impact
A few years ago, a small group of engineers at Mozilla introduced a process to identify the tasks that would have the greatest impact on the performance of Firefox. They … Read more
What’s new with the Firefox Profiler? (Q3 2022)
As the Perf-Tools team, we are responsible for the Firefox Profiler. This newsletter gives an overview of the new features and improvements we’ve made in the third quarter of 2022. … Read more
A different perspective
Usually, in our articles, we talk about performance from the performance engineer’s perspective, but in this one, I want to take a step back and look at it from another … Read more
Performance Tools Newsletter (H1 2022)
As the Perf-Tools team, we are responsible for the Firefox Profiler. This newsletter gives an overview of the new features and improvements we’ve done in the first half of 2022. … Read more
Migrating to Browsertime for Performance Testing
Originally, we used a Web Extension for doing performance testing on Firefox in our Raptor test harness. But, we needed to add new features such as visual metrics, so in … Read more
Reworking our Visual Metrics Processing System
Our visual metrics processing system used to use two separate machines to produce visual metrics from our pageload tests. In this post, I’ll describe how we moved to a single-machine … Read more
Introducing A New Performance Comparison Tool – PerfCompare
Introduction I have been a member of the performance test team for the past two and a half years. During that time, the performance team has had many discussions about … Read more
Prioritized Task Scheduling API is Prototyped in Nightly
In bug 1734997, we prototyped the Prioritized Task Scheduling API. Having the API prototyped empowers us to experiment with the benefits of this API. It is enabled by default in … Read more
Performance Sheriff Newsletter (March 2022)
In March there were 175 alerts generated, resulting in 21 regression bugs being filed on average 5.4 days after the regressing change landed. Welcome to the March 2022 edition of … Read more
Performance Sheriff Newsletter (February 2022)
In February there were 122 alerts generated, resulting in 19 regression bugs being filed on average 4.3 days after the regressing change landed. Welcome to the February 2022 edition of … Read more
Performance Sheriff Newsletter (January 2022)
In January there were 161 alerts generated, resulting in 20 regression bugs being filed on average 13.4 days after the regressing change landed. Welcome to the January 2022 edition of … Read more
Performance Tools Newsletter (Q4 2021)
As the Perf-Tools team, we are responsible for the Firefox Profiler. This newsletter gives an overview of the new features and improvements we’ve done in Q4 2021. You can find … Read more