Tim Kadlec
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Tagged: monitoring

10 posts

  • December 8, 2022

    Variability Isn't the Problem

    • performance
    • variability
    • monitoring
  • December 2, 2022

    Web Performance Calendar » A Performance Maturity Matrix

    Drawing upon each model, I tried to roughly gauge the perf maturity of organizations, but found I needed a more visual aid — a map of perf work that I would help me identify where orgs are in their perf journey: what areas of performance there are and what level they are in those areas. So I drew up a “Performance Maturity Matrix” with four levels including a “null” level (i.e. lacking the traits of performance maturity) and nine areas of perf work.

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  • January 12, 2021

    Understanding the True Cost of Client-Side A/B Testing

    • performance
    • edge computing
    • testing
  • May 21, 2020

    A/B Testing Instant.Page With Netlify and Speedcurve

    • performance
    • metrics
    • monitoring
  • April 12, 2020

    Mundane Improvements, Big Impact

    • performance
    • shopify
    • metrics
  • November 1, 2019

    Understanding Performance Regions - Noteworthy - The Journal Blog

    A rather clever way of looking at performance data by breaking it down into histogram "regions".

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  • October 18, 2019

    Netlify Build Plugin for SpeedCurve

    • performance
    • productivity
    • tools
  • May 29, 2019

    Characteristics of a Strong Performance Culture

    • performance
    • culture
    • monitoring
  • March 7, 2019

    Performance Budgets That Stick

    • performance
    • performance budget
    • metrics
  • October 31, 2018

    The Three Types of Performance Testing – CSS Wizardry – CSS Architecture, Web Performance Optimisation, and more, by Harry Roberts

    I like Harry's categorization for performance testing:

    I try to distill the types of testing that we do into three distinct categories: Proactive, Reactive, and Passive.

    I've been using "Active" and "Passive" myself and found that it really helps companies better understand why having both synthetic and RUM monitoring in place is important. I really like the way Harry breaks that "Active" category out further based on whether the tests are run proactively or reactively.

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© 2026 Tim Kadlec.

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