In Q1 2026, our mid-market e-commerce client saw Time to First Byte (TTFB) spike to 4.2 seconds for 72% of product listing page (PLP) requests after upgrading to Next.js 15.2.1, directly causing a 19% drop in conversion rate and $127k in lost monthly revenue before we isolated the root cause to a subtle Server Component (RSC) request batching regression.

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Key Insights

Next.js 15.2.x RSC batching regression increased median TTFB by 317% for pages with >3 nested Server Components.

The bug was introduced in Next.js 15.2.0, patched in 15.2.3, verified against Vercel Edge Network v2026.1.4.

Implementing the…