perf: reduce Vercel data transfer costs with CDN optimization#1057
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perf: reduce Vercel data transfer costs with CDN optimization#1057
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- Increase polling intervals (markets 8→12min, feeds 15→20min, crypto 8→12min) - Increase background tab hiddenMultiplier from 10→30 (polls 3x less when hidden) - Double CDN s-maxage TTLs across all cache tiers in gateway - Add CDN-Cache-Control header for Cloudflare-specific longer edge caching - Add ETag generation + 304 Not Modified support in gateway (zero-byte revalidation) - Add CDN-Cache-Control to bootstrap endpoint - Add explicit SPA rewrite rule in vercel.json for CF proxy compatibility - Add Cache-Control headers for /map-styles/, /data/, /textures/ static paths
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aldoyh
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Mar 6, 2026
…3#1057) - Increase polling intervals (markets 8→12min, feeds 15→20min, crypto 8→12min) - Increase background tab hiddenMultiplier from 10→30 (polls 3x less when hidden) - Double CDN s-maxage TTLs across all cache tiers in gateway - Add CDN-Cache-Control header for Cloudflare-specific longer edge caching - Add ETag generation + 304 Not Modified support in gateway (zero-byte revalidation) - Add CDN-Cache-Control to bootstrap endpoint - Add explicit SPA rewrite rule in vercel.json for CF proxy compatibility - Add Cache-Control headers for /map-styles/, /data/, /textures/ static paths
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Summary
Reduces Vercel bandwidth and request costs through polling optimization, aggressive CDN caching, and ETag-based revalidation. Paired with Cloudflare Cache Rules configured on the dashboard.
Changes
hiddenMultiplier10→30 (hidden tabs poll 3x less)vercel.jsonnow has a catch-all rewrite toindex.htmlfor CF proxy compatibilityimmutableCache-Control for/map-styles/,/data/,/textures/Cloudflare Cache Rules (configured separately)
/sw.js,/,/index.html/assets/,/map-styles/,/data/,/textures//favico/Estimated impact
~$900/month reduction (70%) when combined with CF proxy on main domain
Test plan
ETagheader:curl -I https://api.worldmonitor.app/api/market/v1/list-market-quotes?symbols=AAPLcurl -H 'If-None-Match: "<etag>"' -I https://api.worldmonitor.app/api/market/v1/list-market-quotes?symbols=AAPLCDN-Cache-Controlheader present on API responses