coolify.io

The numbers

First visit

0.355 g CO₂e

Return visit

<0.001 g CO₂e

Hosting

verified green

LCP

172 ms

CLS

0.316

TTFB

29 ms

At 10,000 views a month this page emits about 32.0 kg CO₂e a year, roughly 131 km in an average petrol car. The estimate assumes 75% new and 25% returning visitors, a measured cache reload ratio of 0%, and world-average grid intensity. How we calculate this

1. Audit third-party servicessave ~0.120 g/visit (1.32 MB)High impact · moderate effort

   9 third-party domains account for 2.64 MB (90% 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.

   • cdn.coollabs.io1.93 MB
   • github.com608 kB
   • opencollective-production.s3.us-west-1.amazonaws.com51 kB
   • cdn.bsky.app15 kB
   • transcript.lol14 kB
   • static.cloudflareinsights.com12 kB

   WSG 3.5: Treat third parties the same as first parties
2. Convert and compress imagessave ~0.102 g/visit (1.13 MB)High impact · quick fix

   48 images (2.50 MB) ship in legacy formats (JPEG/PNG/GIF).

   Serve AVIF (or WebP) with responsive srcset sizes, and re-compress oversized files. AVIF typically halves JPEG weight at the same visual quality.

   • goldenvm.png710 kB
   • arvensis.png228 kB
   • web3jobs.png227 kB
   • cryptojobslist.png159 kB
   • hetzner.jpg135 kB

   WSG 2.9: Optimize media to reduce resource use
3. Serve images at the size they displaysave ~0.0060 g/visit (66 kB)Medium impact · quick fix

   15 images are encoded at more than twice the pixels the layout shows, even accounting for this viewport's pixel density.

   Generate multiple sizes and let the browser pick with srcset/sizes; a 4000px original behind a 400px slot spends bandwidth no screen displays.

   • goldenvm.png710 kB
   • arvensis.png228 kB
   • hetzner.jpg135 kB
   • sassykit.jpeg65 kB
   • codext.jpg51 kB

   WSG 2.9: Optimize media to reduce resource use
4. Lazy-load below-the-fold mediasave ~0.0027 g/visit (30 kB)Medium impact · quick fix

   20 below-the-fold images/iframes (350 kB) download immediately for every visitor.

   Add loading="lazy" to below-fold img and iframe elements (and keep it off the LCP image). Browsers then fetch them only when scrolling approaches.

   • hetzner.jpg135 kB
   • juxtdigital.png106 kB
   • bc.png27 kB
   • supaguide.png16 kB
   • ramnode.png11 kB

   WSG 2.9: Optimize media to reduce resource use
5. Optimize web fontssave ~0.0068 g/visit (75 kB)Advisory · quick fix

   2 font files total 213 kB.

   Subset fonts to used glyphs, prefer one variable font over multiple weights, serve WOFF2 only, and consider system fonts for UI text.

   • Phosphor-Duotone.BOGiEKDk.woff2165 kB
   • inter-latin.woff249 kB

   WSG 2.11: Use optimized web typography
6. Upgrade compression beyond gzipsave ~0.0028 g/visit (30 kB)Advisory · quick fix

   202 kB of text ships gzip-compressed; Brotli or Zstandard would cut roughly another 15-20%, and browsers without them fall back to gzip automatically.

   Serve precompressed Brotli for static text assets (highest level, compressed at build time) and enable Brotli or zstd for dynamic responses; keep gzip only as the fallback.

   • Layout.D-uAUAVb.css36 kB
   • v4513226cdae34746b4dedf0b4dfa099e178179150949612 kB
   • SmallSponsors.B1MCwxPs.js11 kB
   • coolify.io11 kB
   • template.AaruPc59.js10 kB

   WSG 4.3: Reduce data transfer with compression
7. Set a page-weight budgetAdvisory · moderate effort

   At 2.93 MB per view this page rates D. The findings above list where the weight is.

   Agree a transfer budget (e.g. under 975 kB reaches a B), enforce it in CI, and re-scan after each change to hold the line.

   WSG 3.1: Set goals based on performance and energy impact

Where the bytes are

• Images2.62 MB · 85 req
• Fonts213 kB · 2 req
• JavaScript48 kB · 18 req
• CSS39 kB · 3 req
• HTML11 kB · 1 req
• Data (fetch)7.2 kB · 4 req
• Data (XHR)153 B · 1 req