Next.js 15 Patterns That Cut Your TTFB in Half

Start with a baseline

Measure before you optimize. Capture TTFB, LCP, and API latency by route so the team can prioritize high-impact work.

Layered cache strategy

Use cache layers by data volatility:

• Static or revalidated server content for marketing pages
• Per-tenant caching for dashboard shells
• On-demand revalidation for critical workflow updates

Route-level decisions

Treat each route independently. A global caching policy usually over-caches sensitive data or under-caches expensive queries.

Server actions in production

Server actions reduce boilerplate, but you should still enforce validation, auth checks, and audit logs in the action boundary.

"use server";

export async function updateWorkspaceName(name: string) {
  await requireSession();
  const cleanName = name.trim();
  if (!cleanName) throw new Error("Workspace name is required");

  return db.workspace.update({
    where: { id: "current" },
    data: { name: cleanName },
  });
}

Performance checklist

• Stream large pages where possible
• Keep client components focused and small
• Move data joins to the server layer
• Profile hydration on dashboard routes