eliasfarhan.ch/gamedev/cpp/2026/08/14/srnative-01-why-a-custom-engine.html

The numbers

First visit

0.919 g CO₂e

Return visit

<0.001 g CO₂e

Hosting

verified green

LCP

316 ms

CLS

0.109

TTFB

29 ms

At 10,000 views a month this page emits about 82.7 kg CO₂e a year, roughly 339 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 ~0.175 g/visit (1.92 MB)High impact · quick fix

   57 images (4.27 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.

   • Miegakure.png1.21 MB
   • trials.png670 kB
   • unity_runtimefee.png412 kB
   • civ_iv.jpg403 kB
   • gamescom26_SS%20(6).jpg265 kB

   WSG 2.9: Optimize media to reduce resource use
2. Audit third-party servicessave ~0.173 g/visit (1.90 MB)High impact · moderate effort

   12 third-party domains account for 3.80 MB (50% 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.

   • platform.twitter.com2.87 MB
   • pbs.twimg.com611 kB
   • embed.bsky.app215 kB
   • cdn.bsky.app40 kB
   • platform.x.com28 kB
   • www.google-analytics.com22 kB

   WSG 3.5: Treat third parties the same as first parties
3. Lazy-load below-the-fold mediasave ~0.163 g/visit (1.80 MB)High impact · quick fix

   20 below-the-fold images/iframes (3.60 MB) 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.

   • Miegakure.png1.21 MB
   • trials.png670 kB
   • unity_runtimefee.png412 kB
   • civ_iv.jpg403 kB
   • gamescom26_SS%20(6).jpg265 kB

   WSG 2.9: Optimize media to reduce resource use
4. Reduce JavaScript payloadsave ~0.069 g/visit (755 kB)High impact · moderate effort

   78 scripts total 3.02 MB on the wire (9.75 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.

   • post-m4-dscTF.js205 kB
   • embed.9449.78398904051446294e3d.js164 kB
   • embed.9449.78398904051446294e3d.js164 kB
   • embed.9449.78398904051446294e3d.js164 kB
   • embed.9449.78398904051446294e3d.js164 kB

   WSG 3.2: Minify and remove unused codeWSG 3.3: Modularize bandwidth-heavy components
5. Serve images at the size they displaysave ~0.012 g/visit (129 kB)Medium impact · quick fix

   7 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.

   • Miegakure.png1.21 MB
   • unity_runtimefee.png412 kB
   • civ_iv.jpg403 kB
   • gamescom26_SS%20(6).jpg265 kB
   • romulan_cascaded.png209 kB

   WSG 2.9: Optimize media to reduce resource use
6. Upgrade compression beyond gzipsave ~0.044 g/visit (481 kB)Advisory · quick fix

   3.20 MB 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.

   • post-m4-dscTF.js205 kB
   • embed.9449.78398904051446294e3d.js164 kB
   • embed.9449.78398904051446294e3d.js164 kB
   • embed.9449.78398904051446294e3d.js164 kB
   • embed.9449.78398904051446294e3d.js164 kB

   WSG 4.3: Reduce data transfer with compression
7. Stop downloading the same asset twicesave ~0.022 g/visit (245 kB)Advisory · quick fix

   8 assets were fetched more than once in a single page load (2.45 MB of repeated transfer).

   Usually a script injected twice or cache-busting query strings that differ per reference. Load each asset once and let the HTTP cache do its job.

   • embed.9449.78398904051446294e3d.js9 downloads · 1.47 MB
   • embed.Tweet.70198ef24afe05adbecf.js9 downloads · 121 kB
   • embed.runtime.3b19346e5d08b0b587c7.js9 downloads · 39 kB
   • embed.749.467388cca0b3fe9c3291.js9 downloads · 62 kB
   • embed.ondemand.i18n.en-js.19a28d85d7fc7916b4b…9 downloads · 15 kB

   WSG 3.2: Minify and remove unused code
8. Set a page-weight budgetAdvisory · moderate effort

   At 7.59 MB per view this page rates F. 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
9. 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.

   • eliasfarhan.ch23 requests over http/1.1

   WSG 3.1: Set goals based on performance and energy impact

Where the bytes are

• Images4.40 MB · 66 req
• JavaScript3.02 MB · 78 req
• HTML140 kB · 12 req
• Data (XHR)13 kB · 10 req
• CSS8.1 kB · 2 req
• Other4.7 kB · 2 req
• Data (fetch)2.5 kB · 2 req