www.netflix.com

The numbers

First visit

0.610 g CO₂e

Return visit

0.100 g CO₂e

Hosting

unknown

LCP

1.13 s

CLS

0.004

TTFB

299 ms

At 10,000 views a month this page emits about 57.9 kg CO₂e a year, roughly 237 km in an average petrol car. The estimate assumes 75% new and 25% returning visitors, a measured cache reload ratio of 16%, and world-average grid intensity. How we calculate this

1. Audit third-party servicessave ~0.202 g/visit (1.72 MB)High impact · moderate effort

   10 third-party domains account for 3.51 MB (85% 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.

   • assets.nflxext.com1.14 MB
   • www.gstatic.com1.07 MB
   • occ.a.nflxso.net521 kB
   • help.nflxext.com353 kB
   • occ-0-2774-2773.1.nflxso.net276 kB
   • fonts.gstatic.com81 kB

   WSG 3.5: Treat third parties the same as first parties
2. Reduce JavaScript payloadsave ~0.056 g/visit (481 kB)High impact · moderate effort

   9 scripts total 1.92 MB on the wire (6.89 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.

   • nmhpFrameworkClient.2243432047f3e14ae897.js755 kB
   • recaptcha__en.js341 kB
   • recaptcha__en.js340 kB
   • recaptcha__en.js340 kB
   • otBannerSdk.js138 kB

   WSG 3.2: Minify and remove unused codeWSG 3.3: Modularize bandwidth-heavy components
3. Convert and compress imagessave ~0.036 g/visit (306 kB)High impact · quick fix

   14 images (680 kB) 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.

   • DE-en-20260803-TRIFECTA-perspective_c7943cab-…385 kB
   • AAAABVjVl0aHRt-hYHpwCveQzEb_GH2_7_xN5IPcDYs7P…44 kB
   • AAAABX6hzzLKHdEngqYOQReB2zdMkrnEjvee71EEFOrM6…36 kB
   • AAAABUemhBMcOVz_62GFLeCoGWai7vKpovypv6hP8DiIw…34 kB
   • AAAABbUnQGlvrJHIRvj2xr20lvFYiUVyXLGiab2Pqq9PH…32 kB

   WSG 2.9: Optimize media to reduce resource use
4. Optimize web fontssave ~0.025 g/visit (209 kB)Medium impact · quick fix

   4 font files total 598 kB.

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

   • netflix-sans-core-variable-full.woff2451 kB
   • netflix-sans-mono-variable-full.woff266 kB
   • KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBA.woff241 kB
   • KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBA.woff240 kB

   WSG 2.11: Use optimized web typography
5. Enable text compressionsave ~0.014 g/visit (118 kB)Medium impact · quick fix

   3 text resources (168 kB) are served without gzip/Brotli.

   Enable Brotli (or at least gzip) on the server or CDN for HTML, CSS, JavaScript, JSON and SVG. Typical reduction is ~70%.

   • en.json83 kB
   • otPcTab.json70 kB
   • otFlat.json16 kB

   WSG 4.3: Reduce data transfer with compression
6. 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
7. Upgrade compression beyond gzipsave ~0.046 g/visit (396 kB)Advisory · quick fix

   2.64 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.

   • nmhpFrameworkClient.2243432047f3e14ae897.js755 kB
   • netflix.com599 kB
   • recaptcha__en.js341 kB
   • recaptcha__en.js340 kB
   • recaptcha__en.js340 kB

   WSG 4.3: Reduce data transfer with compression
8. Stop downloading the same asset twicesave ~0.0087 g/visit (74 kB)Advisory · quick fix

   2 assets were fetched more than once in a single page load (720 kB 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.

   • recaptcha__en.js3 downloads · 1.02 MB
   • KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBA.woff22 downloads · 81 kB

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

   At 4.12 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
10. Remove the entry redirectAdvisory · quick fix

    The address that was scanned goes through 1 redirect before the document is served, ending at https://www.netflix.com/. Every hop is a full round trip on a connection that has not warmed up yet.

    Point links, sitemaps and canonical tags at the final address, and make the host redirect in one hop rather than chaining http to https to www.

    • https://netflix.com/redirects to https://www.netflix.com/

    WSG 4.4: Setup necessary error pages and redirection links
11. Upgrade connections to HTTP/2 or HTTP/3Advisory · quick fix

    4 hosts serve 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.

    • help.nflxext.com11 requests over http/1.1
    • occ-0-2774-2773.1.nflxso.net10 requests over http/1.1
    • logs.netflix.com6 requests over http/1.1
    • occ.a.nflxso.net6 requests over http/1.1

    WSG 3.1: Set goals based on performance and energy impact

Where the bytes are

• JavaScript1.92 MB · 9 req
• Images691 kB · 20 req
• HTML669 kB · 5 req
• Fonts598 kB · 4 req
• Data (fetch)179 kB · 10 req
• CSS44 kB · 3 req
• Data (XHR)14 kB · 6 req
• Other0 B · 6 req