cott Labz
Field Notes: Performance
Speed and score work: what was slowing pages down, what fixed it, and what the numbers looked like after.
The Diff That Compared Two Broken Pages
A pixel-by-pixel check passed on every page while two visible regressions were live - because the baseline already had them.
The Cleanup Pass
A batch of small, unrelated-looking issues that were quietly capping every score that matters.
Async Everywhere Would Have Broken the Footer
A site-wide script audit, and the one script the rule said should defer but couldn't.
The Fix That Dropped the Score First
A mobile PageSpeed audit that dropped before it improved - and why.