openai.com/index/gpt-6-astra

The numbers

First visit

3.14 g CO₂e

Return visit

0.018 g CO₂e

Hosting

verified green

LCP

3.05 s

CLS

0

TTFB

436 ms

At 10,000 views a month this page emits about 282.8 kg CO₂e a year, roughly 1159 km in an average petrol car. The estimate assumes 75% new and 25% returning visitors, a measured cache reload ratio of 1%, and world-average grid intensity. How we calculate this

1. Audit third-party servicessave ~0.979 g/visit (10.76 MB)High impact · moderate effort

   7 third-party domains account for 21.52 MB (83% 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.

   • tidal-rush-paradise-gp.skirano.chatgpt.site20.85 MB
   • ab.chatgpt.com355 kB
   • images.ctfassets.net305 kB
   • static.cloudflareinsights.com10 kB
   • chatgpt.com2.8 kB
   • statsigapi.net356 B

   WSG 3.5: Treat third parties the same as first parties
2. Convert and compress imagessave ~0.845 g/visit (9.29 MB)High impact · quick fix

   6 images (20.65 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.

   • vehicles.png3.74 MB
   • details.png3.62 MB
   • vegetation.png3.59 MB
   • island.png3.50 MB
   • characters.png3.22 MB

   WSG 2.9: Optimize media to reduce resource use
3. Reduce JavaScript payloadsave ~0.089 g/visit (982 kB)High impact · moderate effort

   115 scripts total 3.93 MB on the wire (12.77 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.

   • 3op_qfyvv28t-.js333 kB
   • 1e-xsj9wkj-7b.js316 kB
   • 0p5mwxnzouhgl.js306 kB
   • 3nnffl-o1ohw_.js292 kB
   • 0iib69ob_qk5h.js165 kB

   WSG 3.2: Minify and remove unused codeWSG 3.3: Modularize bandwidth-heavy components
4. 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 · 81 kB
   • api.jsCache-Control: max-age=31536000, stale-if-error=10800, stale-while-revalidate=31536000, public · 28 kB

   WSG 4.2: Optimize caching and support offline access
5. Optimize web fontssave ~0.0089 g/visit (98 kB)Advisory · quick fix

   5 font files total 280 kB.

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

   • OpenAISans-RegularItalic.woff257 kB
   • OpenAISans-Semibold.woff257 kB
   • OpenAISans-Medium.woff257 kB
   • OpenAISans-Bold.woff256 kB
   • OpenAISans-Regular.woff254 kB

   WSG 2.11: Use optimized web typography
6. Upgrade compression beyond gzipsave ~0.0060 g/visit (66 kB)Advisory · quick fix

   443 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.

   • higgsfield-cognition-balanced.svg212 kB
   • three-core-DhTiTlGu.js131 kB
   • index-2jdH-c9V.js39 kB
   • lovable-cognition-balanced.svg12 kB
   • beacon.min.js10 kB

   WSG 4.3: Reduce data transfer with compression
7. Remove references to broken resourcessave ~0.0050 g/visit (55 kB)Advisory · quick fix

   18 requests 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.

   • sdk_exceptionHTTP 401 · 356 B
   • 3510127618HTTP 403 · 6.8 kB
   • 3157804138HTTP 403 · 6.8 kB
   • 28ica5vft-yl_.jsHTTP 403 · 0 B
   • 250mlilh8w-sn.jsHTTP 403 · 0 B

   WSG 4.4: Setup necessary error pages and redirection links
8. Set a page-weight budgetAdvisory · moderate effort

   At 25.92 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

Where the bytes are

• Images20.96 MB · 13 req
• JavaScript3.93 MB · 115 req
• Data (fetch)413 kB · 16 req
• Fonts280 kB · 5 req
• CSS170 kB · 23 req
• HTML143 kB · 2 req
• Other18 kB · 18 req
• Data (XHR)3.2 kB · 3 req