Monoliths wheeze; headless sprints. Pair a commerce API (Saleor, Medusa, Shopify Storefront) with Next.js and push rendering to the edge. Product pages hydrate via React Server Components and stream above-the-fold content fast; the rest trickles in without blocking interaction. Use ISR with short revalidate windows for price/stock while pinning critical SKUs to stale-while-revalidate caches at POPs. Result: sub-second TTFB in real markets, not just lab tests.

Core Web Vitals aren’t buzzwords—they’re the scoreboard.

• LCP: serve hero images through Next/Image with fixed dimensions and responsive srcset; preconnect to the image CDN.
• INP: prune client JS, prefer RSC for product details, lazy-hydrate carousels.
• CLS: lock layout with aspect ratios; avoid ad shifts.

SEO loves speed and structure. Bake JSON-LD (Product, Offer, Breadcrumb) server-side; generate clean URLs (/category/slug) with canonical tags to tame faceted filters. Ship edge sitemaps and incremental robots.txt rules for seasonal drops. For search pages, lean on middleware caching + query whitelists to prevent crawl traps.

Personalization? Run edge middleware to route by geo or campaign and fetch pricing from a nearest KV store; keep it cache-aware to avoid a miss storm. Measure with RUM (web-vitals + user timing), not just Lighthouse. The playbook is simple: render at the edge, cache with intent, structure for bots, and keep the JS diet lean. Rankings follow speed.

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