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Clinford Jordano Valencia

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Clinford Jordano Valencia
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Core Web Vitals and Web Performance at Traveloka

Performance work on high-traffic, conversion-critical pages, driven by real-user measurement and performance budgets.

Role
Software Engineer (Web)
Period
2018–2025
Stack
Core Web Vitals · Next.js · Real-user monitoring · Code splitting

The problem

These were high-traffic, conversion-critical web experiences, so performance had to be measured from what users actually experienced, not from a developer laptop.

The approach

  • Measure real users first. Real-user measurement decided what to fix, and performance budgets kept regressions from creeping back in.
  • Cut the JavaScript the browser has to run: code splitting, lazy loading and dependency optimization.
  • Fix the rest of the path: JavaScript execution, rendering, networking, images and third-party scripts.

Talking about it

I turned the lessons into talks: "Performance: Core Web Vitals Top Recommendations + INP" at DevFest Jakarta 2023, and "Bridging the Gap: Making It Easier to Build for the Web" at Google I/O Extended Jakarta 2022.

I also write about it: the event loop is not what you think explains the long tasks behind poor INP and how to break them up.