Measured 2026-10-02

Performance and page weight

Headless Chromium, cache disabled, page load to network idle. Transfer = compressed bytes received (Chrome DevTools Protocol). Median of 3 runs per page, live site and pilot measured in the same session.

Page	Version	Load to idle	Requests	Transfer	gCO₂e / visit
Our Cities (desktop)	Live site	8.1 s	56	2.1 MB	0.36
Our Cities (desktop)	Pilot	1.4 s	13	453 KB 79% less	0.08
Our Cities (mobile)	Live site	7.0 s	56	2.1 MB	0.36
Our Cities (mobile)	Pilot	1.5 s	13	453 KB 79% less	0.08
City profile	Live site	4.8 s	45	1.4 MB	0.24
City profile	Pilot	1.3 s	12	154 KB 89% less	0.03

gCO₂e per visit: Sustainable Web Design model (0.36 kWh/GB, 494 gCO₂e/kWh global grid average), first visit, uncached.