Optimize image loading and enable CDN prerendering - #104
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- Enable prerender=true on blog/[slug] so posts are served from CDN edge instead of a cold-start serverless function on every hit. Language preference is restored client-side via the existing onMount localStorage/cookie path; the mounted guard suppresses animations during that switch so there is no visible flash. - Add rehypeLazyImages plugin: injects loading="lazy" decoding="async" on all markdown <img> elements, preventing off-screen images from blocking page load. https://claude.ai/code/session_01LUqv8ytzvon7XCZLMWyrau
- Enable prerender=true on projects/[slug] (same pattern as blog/[slug]). - Add <link rel="preconnect"> for PUBLIC_CONVEX_URL in root layout so the browser starts the DNS/TCP/TLS handshake to Convex before JS executes, reducing WebSocket cold-start latency for real-time data. - Add Cache-Control headers for /images/* in vercel.json: 7-day browser TTL, 30-day CDN TTL, 1-day stale-while-revalidate. Images are not URL-fingerprinted so immutable is avoided. https://claude.ai/code/session_01LUqv8ytzvon7XCZLMWyrau
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@claude what about og image for articles? |
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Summary
This PR improves performance by enabling CDN edge prerendering for blog and project pages, adding lazy loading to all markdown images, and configuring aggressive caching for image assets.
Key Changes
rehypeLazyImages.js): Automatically addsloading="lazy"anddecoding="async"attributes to all<img>elements in markdown, reducing initial page load impactsrc/routes/blog/[slug]/+page.tsandsrc/routes/projects/[slug]/+page.ts): Changedprerender = falsetoprerender = trueso pages are served from CDN edge locations. Language preference is now restored client-side via localStorage/cookie inonMountwith a mounted guard to suppress animations during the initial switchvercel.json): Added Cache-Control header for/images/*with 7-day browser cache and 30-day CDN cache, plus stale-while-revalidate for resiliencesrc/routes/+layout.svelte): Added<link rel="preconnect">to Convex URL to reduce connection latency for real-time featuresImplementation Details
rehypeLazyImagesplugin is integrated into the mdsvex pipeline and only sets lazy/async attributes if not already present, preserving any explicit configurationhttps://claude.ai/code/session_01LUqv8ytzvon7XCZLMWyrau