Reduce data transfer with compression

How to satisfy it

• Enable Brotli or Zstandard, with gzip as the fallback, for every text content type. Evergreen browsers accept both; the gzip fallback covers the rest.
• Check JSON API responses and SVG: both are text and both are often missed.
• Confirm the CDN is not stripping or bypassing compression.

Measured pages failing this guideline

From the 60 most recently measured pages. Each links to its full report.

• console.hyperfluid.cloud22 text resources (1.93 MB) are served without gzip/Brotli.0.213 g CO₂e · 2.35 MB · about 1.35 MB recoverableD
• yadyok.bogazici.edu.tr9 text resources (1.20 MB) are served without gzip/Brotli.3.28 g CO₂e · 29.49 MB · about 842 kB recoverableF
• qwen.ai1.91 MB of text ships gzip-compressed; Brotli or Zstandard would cut roughly another 15-20%, and browsers without them fall back to gzip automatically.0.279 g CO₂e · 2.18 MB · about 286 kB recoverableE
• qwen.ai1.76 MB of text ships gzip-compressed; Brotli or Zstandard would cut roughly another 15-20%, and browsers without them fall back to gzip automatically.0.553 g CO₂e · 4.91 MB · about 264 kB recoverableF
• forum.donanimhaber.com1.75 MB of text ships gzip-compressed; Brotli or Zstandard would cut roughly another 15-20%, and browsers without them fall back to gzip automatically.0.510 g CO₂e · 4.48 MB · about 263 kB recoverableF
• huggingface.co1.39 MB of text ships gzip-compressed; Brotli or Zstandard would cut roughly another 15-20%, and browsers without them fall back to gzip automatically.2.98 g CO₂e · 20.59 MB · about 208 kB recoverableF
• www.netcup.com1.23 MB of text ships gzip-compressed; Brotli or Zstandard would cut roughly another 15-20%, and browsers without them fall back to gzip automatically.0.253 g CO₂e · 2.75 MB · about 185 kB recoverableD
• open.spotify.com1.22 MB of text ships gzip-compressed; Brotli or Zstandard would cut roughly another 15-20%, and browsers without them fall back to gzip automatically.0.551 g CO₂e · 6.05 MB · about 183 kB recoverableF
• openrouter.ai1.21 MB of text ships gzip-compressed; Brotli or Zstandard would cut roughly another 15-20%, and browsers without them fall back to gzip automatically.0.452 g CO₂e · 4.88 MB · about 182 kB recoverableF
• unstructured.io1.17 MB of text ships gzip-compressed; Brotli or Zstandard would cut roughly another 15-20%, and browsers without them fall back to gzip automatically.2.36 g CO₂e · 21.15 MB · about 176 kB recoverableF
• www.smithsonianmag.com1.16 MB of text ships gzip-compressed; Brotli or Zstandard would cut roughly another 15-20%, and browsers without them fall back to gzip automatically.0.410 g CO₂e · 4.46 MB · about 174 kB recoverableF
• www.renaultgroup.com1.16 MB of text ships gzip-compressed; Brotli or Zstandard would cut roughly another 15-20%, and browsers without them fall back to gzip automatically.0.291 g CO₂e · 2.62 MB · about 174 kB recoverableE