open.spotify.com

The numbers

First visit

0.732 g CO₂e

Return visit

0.0083 g CO₂e

Hosting

verified green

LCP

2.60 s

CLS

0.634

TTFB

53 ms

At 10,000 views a month this page emits about 66.1 kg CO₂e a year, roughly 271 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 ~0.273 g/visit (3.00 MB)High impact · moderate effort

   13 third-party domains account for 6.00 MB (99% 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.

   • open.spotifycdn.com2.31 MB
   • i.scdn.co973 kB
   • encore.scdn.co958 kB
   • www.gstatic.com750 kB
   • cdn.cookielaw.org369 kB
   • pickasso.spotifycdn.com262 kB

   WSG 3.5: Treat third parties the same as first parties
2. Reduce JavaScript payloadsave ~0.065 g/visit (717 kB)High impact · moderate effort

   48 scripts total 2.87 MB on the wire (10.73 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.

   • web-player.c3b3f435.js1.04 MB
   • recaptcha__en.js355 kB
   • recaptcha__en.js355 kB
   • vendor~web-player.00da8f6b.js245 kB
   • gtm.js174 kB

   WSG 3.2: Minify and remove unused codeWSG 3.3: Modularize bandwidth-heavy components
3. Convert and compress imagessave ~0.057 g/visit (622 kB)High impact · quick fix

   50 images (1.38 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.

   • ab67616d00001e02bbd45c8d36e0e045ef64041158 kB
   • ab67616d00001e02f91035273284611f9ae398ed58 kB
   • region_de_default.jpg48 kB
   • ab67616d00001e02994c295dc193fa50dde7f13d48 kB
   • region_global_default.jpg47 kB

   WSG 2.9: Optimize media to reduce resource use
4. Optimize web fontssave ~0.032 g/visit (349 kB)Medium impact · quick fix

   8 font files total 998 kB.

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

   • SpotifyMixUITitleVariable-8769ccfde3379b7ebca…382 kB
   • SpotifyMixUITitleVariable-08bab3354d40f74e517…371 kB
   • SpotifyMixUI-Bold-09c45a3a0ce9d2971e62cb26e97…48 kB
   • SpotifyMixUI-Regular-76c92fb1a35c462f73429fa8…45 kB
   • SpotifyMixUI-Bold-4264b799009b1db5c491778b1bc…42 kB

   WSG 2.11: Use optimized web typography
5. Collapse the redirect chainMedium impact · quick fix

   The address that was scanned goes through 2 redirects before the document is served, ending at https://open.spotify.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://spotify.com/redirects to https://open.spotify.com/

   WSG 4.4: Setup necessary error pages and redirection links
6. Upgrade compression beyond gzipsave ~0.017 g/visit (183 kB)Advisory · quick fix

   1.22 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.

   • recaptcha__en.js355 kB
   • recaptcha__en.js355 kB
   • otBannerSdk.js131 kB
   • iab2V2Data.json91 kB
   • de.json84 kB

   WSG 4.3: Reduce data transfer with compression
7. Stop downloading the same asset twicesave ~0.0036 g/visit (39 kB)Advisory · quick fix

   7 assets were fetched more than once in a single page load (367 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.js2 downloads · 710 kB
   • 171.9e2bc092.js2 downloads · 9.7 kB
   • 2678.5092c47e.js2 downloads · 4.0 kB
   • 1905.b8f2e40e.js2 downloads · 9.0 kB
   • apresolve.spotify.com3 downloads · 645 B

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

   At 6.05 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. Simplify the document structureAdvisory · larger effort

   The page renders 3316 DOM elements, above the 1,500 guideline. Large trees cost memory and CPU on every visitor's device.

   Flatten wrapper markup, render long lists virtually or paginate, and prefer semantic elements over nested divs.

   WSG 3.6: Ensure code follows good semantic practices
10. 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.

    • gew4-spclient.spotify.com11 requests over http/1.1

    WSG 3.1: Set goals based on performance and energy impact

Where the bytes are

• JavaScript2.87 MB · 48 req
• Images1.39 MB · 53 req
• Fonts998 kB · 8 req
• Other323 kB · 35 req
• Data (fetch)212 kB · 27 req
• CSS197 kB · 17 req
• HTML57 kB · 2 req
• Data (XHR)3.9 kB · 4 req