blog.plover.com/2026/08/02

The numbers

First visit

0.262 g CO₂e

Return visit

<0.001 g CO₂e

Hosting

unknown

LCP

808 ms

CLS

0.143

TTFB

90 ms

At 10,000 views a month this page emits about 23.6 kg CO₂e a year, roughly 97 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. Convert and compress imagessave ~0.084 g/visit (753 kB)High impact · quick fix

   11 images (1.67 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.

   • TOP.jpg815 kB
   • folio211r-th.JPG174 kB
   • john-the-baptist.jpg161 kB
   • tame-foul-th.jpg137 kB
   • tame-foul-2-th.jpg108 kB

   WSG 2.9: Optimize media to reduce resource use
2. Serve images at the size they displaysave ~0.050 g/visit (448 kB)High impact · quick fix

   1 image is 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.

   • TOP.jpg815 kB

   WSG 2.9: Optimize media to reduce resource use
3. Lazy-load below-the-fold mediasave ~0.042 g/visit (381 kB)High impact · quick fix

   9 below-the-fold images/iframes (763 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.

   • folio211r-th.JPG174 kB
   • john-the-baptist.jpg161 kB
   • tame-foul-th.jpg137 kB
   • tame-foul-2-th.jpg108 kB
   • b-th.jpg94 kB

   WSG 2.9: Optimize media to reduce resource use
4. Verify your hosting energyMedium impact · moderate effort

   This host has not published renewable energy evidence with the Green Web Foundation, so its energy source is unknown.

   Choose a provider listed in the Green Web Directory, or ask your current provider to publish evidence (and a carbon.txt). This cuts the data-center share of every single page view.

   • carbon.txtNo carbon.txt found at the site root; publishing one is the lightest first step.

   WSG 4.1: Use sustainable hosting
5. Upgrade connections to HTTP/2 or HTTP/3Advisory · quick fix

   1 host serves five or more resources over HTTP/1.1, paying per-request connection and header overhead newer protocols eliminate.

   Enable HTTP/2 (or HTTP/3) on the server or move the assets behind a CDN that speaks it; multiplexing makes many small requests nearly free.

   • pic.blog.plover.com11 requests over http/1.1

   WSG 3.1: Set goals based on performance and energy impact

Where the bytes are

• Images1.67 MB · 11 req
• JavaScript79 kB · 3 req
• HTML17 kB · 1 req