shademap.app/@50.47788,12.37129,15z,1786563994106t,0b,0p,0m

The numbers

First visit

0.130 g CO₂e

Return visit

0.018 g CO₂e

Hosting

verified green

LCP

204 ms

CLS

0.007

TTFB

66 ms

At 10,000 views a month this page emits about 12.3 kg CO₂e a year, roughly 50 km in an average petrol car. The estimate assumes 75% new and 25% returning visitors, a measured cache reload ratio of 14%, and world-average grid intensity. How we calculate this

1. Audit third-party servicessave ~0.030 g/visit (313 kB)High impact · moderate effort

   9 third-party domains account for 625 kB (58% of the page).

   Remove services that no longer earn their place; load the rest on interaction (facades for embeds, delayed consent-gated tags). Each third party is also a privacy and performance dependency.

   • tiles.mapterhorn.com282 kB
   • www.googletagmanager.com164 kB
   • protomaps.github.io161 kB
   • static.cloudflareinsights.com12 kB
   • fonts.gstatic.com4.3 kB
   • currentuvindex.com914 B

   WSG 3.5: Treat third parties the same as first parties
2. Reduce JavaScript payloadsave ~0.014 g/visit (149 kB)Medium impact · moderate effort

   11 scripts total 595 kB on the wire (1.99 MB decoded). Bundles this size usually carry a lot of unused code.

   Split bundles per route, tree-shake dependencies, and audit with a bundle analyzer or coverage profile. A 25% cut is a conservative target for bundles this size.

   • client-CtWbxNoZ.js333 kB
   • js164 kB
   • main-C82U7mzT.js32 kB
   • index-DPJZdoC3.js18 kB
   • index-93jN86HK.js17 kB

   WSG 3.2: Minify and remove unused codeWSG 3.3: Modularize bandwidth-heavy components
3. Fix caching for returning visitorssave ~0.0033 g/visit (27 kB)Medium impact · quick fix

   On a repeat visit 109 kB of static assets were re-downloaded instead of coming from cache.

   Serve static assets with Cache-Control: public, max-age=31536000, immutable and versioned filenames so returning visitors download almost nothing.

   • v1Cache-Control: private, max-age=0, no-store, no-cache, must-revalidate, post-check=0, pre-check=0 · 79 kB
   • api.jsCache-Control: max-age=31536000, stale-if-error=10800, stale-while-revalidate=31536000, public · 27 kB
   • favicon.icoCache-Control: public, max-age=14400, must-revalidate · 3.8 kB

   WSG 4.2: Optimize caching and support offline access
4. Remove references to broken resourcessave ~<0.001 g/visit (5.0 kB)Advisory · quick fix

   1 request answered 4xx/5xx on load: transfer and connections spent on nothing, on every single visit.

   Delete or fix the references (stale asset URLs, dead third-party tags). Each one is a request the page provably does not need.

   • canopyHTTP 403 · 5.0 kB

   WSG 4.4: Setup necessary error pages and redirection links

Where the bytes are

• JavaScript595 kB · 11 req
• Images297 kB · 25 req
• Data (fetch)168 kB · 12 req
• CSS13 kB · 4 req
• HTML2.9 kB · 1 req
• Data (XHR)1.7 kB · 2 req