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Next.js 15 App Router & Turbopack: 2026 Production Performance Optimization

Master Next.js 15 and React 19 async params/cookies architectures, instant Turbopack compilation, and zero-JS Server Component payloads.

August 17, 20263 min

Asynchronous params and cookies Architecture

In Next.js 15, `params`, `searchParams`, `cookies()`, and `headers()` are asynchronous Promises, preparing applications for React 19 concurrent streaming.

app/blog/[slug]/page.tsx

type Props = { params: Promise<{ slug: string }> };

export default async function BlogPostPage({ params }: Props) {
  const { slug } = await params;
  return <article className="max-w-3xl mx-auto py-12">Post: {slug}</article>;
}