Performance in the Age of AI

The chapters

Part 1 · Build

Rebuilding the Machine to Keep Up With the Fleet

Jul 25, 2026

I build DiveJourney almost entirely through coding agents now. That made the system around them, including tests, types, linting, CI, review, and QA, one of the most important things I maintain.

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Part 2 · Paint

I Gave My Agents Chrome DevTools. They Turned Core Web Vitals Green.

Sep 6, 2026

DiveJourney was getting more traffic and feeling slower on my phone. I gave my coding agents Chrome DevTools and worked through two rounds of fixes. Here is what changed and what I measured.

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Steal the loop

Part 2 ends with the exact agent prompt I used, so you can run a bounded performance pass on your own site.

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