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Climate / Carbon Optimization Notes

Goal: get below 0.185g CO2 per page view (per digitalbeacon.co).

Priority Fixes

1. Google Fonts (highest impact)

  • Currently loading Inter + Source Serif 4 from Google Fonts CDN via head.html lines 113–115
  • Two external DNS connections (fonts.googleapis.com + fonts.gstatic.com)
  • Render-blocking CSS request
  • Full variable font ranges loaded (opsz, wght 100–900, italic + non-italic) — very large payload
  • Fix: self-host via @fontsource/inter and @fontsource/source-serif-4 npm packages, importing only the weights actually used (likely 400, 500, 700 for Inter; 400, 700 for Source Serif 4) and referencing them in main.css via @import

2. Render-blocking webmention script (quick win)

  • webmention.min.js loaded in <head> with no defer or async — blocks rendering
  • Fix: add async or defer to the script tag in head.html line 104

3. Duplicate / empty meta tags (easy cleanup)

  • Two <meta name="viewport"> tags (lines 19 and 35) — remove one
  • Two identical sets of OpenGraph tags (lines 65–69 and 77–82) — remove the duplicate block
  • <meta property="dc:title" content=""> and <meta name="citation_title" content=""> are empty
  • <link rel="dns-prefetch" href="https://jasonheppler.org"> — prefetching own origin, remove it

4. Images (audit needed)

  • Check all images in use across content and static dirs
  • Convert to WebP where not already done
  • Ensure lazy loading (loading="lazy") on all non-hero images
  • Check for any oversized images being scaled down in CSS

Reference