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Bodiam Castle in January

Performance Sheriff Newsletter (January 2022)

Dave Hunt
March 16, 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)

Nazim Can Altinova
February 15, 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 Q4 2021. You can find … Read more

Rust API for the Firefox Profiler

Nazim Can Altinova
February 8, 2022

Firefox Profiler is a tool for analyzing the performance of both websites and Firefox itself. You can visit profiler.firefox.com to learn more about and enable it. Inside the Firefox codebase, … Read more

Another Step in Automating the Pageload Recordings

Alexandru Ionescu
January 27, 2022

Background In a previous article, Kimberly Sereduck told us about Updates to Warm Page Load Tests and how we are continuously working to make our tests more representative of real … Read more

Green Island in December

Performance Sheriff Newsletter (December 2021)

Dave Hunt
January 21, 2022

In December there were 159 alerts generated, resulting in 22 regression bugs being filed on average 5.1 days after the regressing change landed. Welcome to the December 2021 edition of … Read more

London Eye in November

Performance Sheriff Newsletter (November 2021)

Dave Hunt
December 21, 2021

In November there were 147 alerts generated, resulting in 22 regression bugs being filed on average 3.5 days after the regressing change landed. Welcome to the November 2021 edition of … Read more

Updates to Warm Page Load Tests

Kimberly Sereduck
November 30, 2021

Background We have recently begun the process of updating our warm page load tests to be more representative of real user behavior. Cold page load is defined as the first … Read more

Pumpkins in October

Performance Sheriff Newsletter (October 2021)

Dave Hunt
November 26, 2021

In October there were 303 alerts generated, resulting in 45 regression bugs being filed on average 5.2 days after the regressing change landed. Welcome to the October 2021 edition of … Read more

Upgrading Page Load Tests to Mitmproxy 7

Kimberly Sereduck
November 19, 2021

Background mitmproxy is a third-party tool that we use to record and play back page loads in Firefox to detect performance regressions. The page load is “recorded” to a file: … Read more

Performance Tools Newsletter (Q3 2021)

Nazim Can Altinova
November 15, 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 Q3 2021. This is our … Read more

Sunrise in September

Performance Sheriff Newsletter (September 2021)

Dave Hunt
October 18, 2021

In September there were 174 alerts generated, resulting in 23 regression bugs being filed on average 6.4 days after the regressing change landed. Welcome to the September 2021 edition of … Read more

Loch Tummel in August

Performance Sheriff Newsletter (August 2021)

Dave Hunt
October 11, 2021

In August there were 126 alerts generated, resulting in 16 regression bugs being filed on average 3.6 days after the regressing change landed. Welcome to the August 2021 edition of … Read more

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Recent Posts

  • Performance Testing Newsletter (Q4 Edition)
  • Introducing the Chrome Extension for the Firefox Profiler
  • Performance Testing Newsletter (Q3 Edition)
  • Announcing PerfCompare: the new comparison tool !
  • Performance Testing Newsletter, Q2 Edition

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    More articles

    • Sheriffing
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    Sheriffing

    • Performance Sheriff Newsletter (March 2022)
      April 7, 2022
    • Performance Sheriff Newsletter (February 2022)
      March 17, 2022
    • Performance Sheriff Newsletter (January 2022)
      March 16, 2022
    • Performance Sheriff Newsletter (December 2021)
      January 21, 2022
    • Performance Sheriff Newsletter (November 2021)
      December 21, 2021

    Testing

    • Announcing PerfCompare: the new comparison tool !
      October 16, 2024
    • Upgrading Page Load Tests to Mitmproxy 7
      November 19, 2021
    • What’s new in Perfherder?
      July 15, 2021
    • Using the Mach Perftest Notebook
      November 12, 2020
    • Dynamic Test Documentation with PerfDocs
      November 3, 2020

    Profiling

    • Introducing the Chrome Extension for the Firefox Profiler
      December 12, 2024
    • Performance Tools Newsletter (H1 2022)
      July 29, 2022
    • Performance Tools Newsletter (Q3 2021)
      November 15, 2021
    • Performance Tools Newsletter (H1 2021)
      July 8, 2021
    • Profiling media workloads in Firefox
      June 12, 2020

    Uncategorized

    • Introducing the Chrome Extension for the Firefox Profiler
      December 12, 2024
    • Performance Testing Newsletter, Q1 Edition
      April 16, 2024
    • New Sheriffing feature and significant updates to KPI reporting queries
      December 13, 2023
    • The Firefox Profiler team was at FOSDEM 2023
      February 27, 2023
    • What’s new with the Firefox Profiler? (Q3 2022)
      October 27, 2022

    Page Load

    • Another Step in Automating the Pageload Recordings
      January 27, 2022
    • Upgrading Page Load Tests to Mitmproxy 7
      November 19, 2021
    • Improving Firefox Page Load
      June 12, 2020

    Tooling

    • Introducing the Chrome Extension for the Firefox Profiler
      December 12, 2024
    • Announcing PerfCompare: the new comparison tool !
      October 16, 2024
    • Performance Tools Newsletter (Q3 2021)
      November 15, 2021
    • Performance in progress
      August 5, 2021
    • Performance Tools Newsletter (H1 2021)
      July 8, 2021

    Highlights

    • Performance Testing Newsletter (Q4 Edition)
      January 31, 2025
    • Performance Testing Newsletter (Q3 Edition)
      October 31, 2024
    • Performance Testing Newsletter, Q2 Edition
      August 8, 2024
    • Performance Testing Newsletter (Q4 Edition)
      December 18, 2023
    • Introducing A New Performance Comparison Tool – PerfCompare
      June 30, 2022

    Data

    • New Features in Mach Try Perf
      October 26, 2023
    • Ancient Bug Discovered in the Visual Metrics Processing Script
      March 3, 2023
    • Improving the Test Selection Experience with Mach Try Perf
      February 28, 2023
    • Reworking our Visual Metrics Processing System
      July 11, 2022
    • Using the Mach Perftest Notebook
      November 12, 2020

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