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Legacy and unused JavaScript causing performance issues

PerformanceAnything with regards to Next.js performance.Anything with regards to Next.js performance.

Status: Open.

Bug

#86562 In vercel/next.js;

· jkantner opened on Nov 26, 2025

force-dynamic incorrectly forces entire route tree to become dynamic (create-component-tree.tsx bug)

Dynamic RoutesRelated to dynamic routes.Related to dynamic routes.

Loading UI and StreamingRelated to loading UI (loading.tsx) and streaming.Related to loading UI (loading.tsx) and streaming.

Parallel & Intercepting RoutesRelated to Parallel and/or Intercepting routes.Related to Parallel and/or Intercepting routes.

PerformanceAnything with regards to Next.js performance.Anything with regards to Next.js performance.

RuntimeRelated to Node.js or Edge Runtime with Next.js.Related to Node.js or Edge Runtime with Next.js.

Status: Open.

Bug

#86424 In vercel/next.js;

· cruzz77 opened on Nov 22, 2025

Next.js 16 increases TBT (Total Blocking Time)

PerformanceAnything with regards to Next.js performance.Anything with regards to Next.js performance.

Status: Open.

Bug

#86383 In vercel/next.js;

· thernstig opened on Nov 21, 2025

<code>useReportWebVitals</code> (LCP) Intermittently Not Reporting When User is Idle

PerformanceAnything with regards to Next.js performance.Anything with regards to Next.js performance.

Status: Open.

Bug

#86291 In vercel/next.js;

· samtbg opened on Nov 19, 2025

Server requests and latency increased after upgrading from Next.js 15 to 16

linear: nextConfirmed issue that is tracked by the Next.js team.Confirmed issue that is tracked by the Next.js team.

PerformanceAnything with regards to Next.js performance.Anything with regards to Next.js performance.

Status: Open.

Bug

#85470 In vercel/next.js;

· carlos-dubon opened on Oct 28, 2025

User timings are lost in App Router

PerformanceAnything with regards to Next.js performance.Anything with regards to Next.js performance.

Status: Open.

Bug

#83957 In vercel/next.js;

· r34son opened on Sep 18, 2025

On the custom server, DeprecationWarning: <code>url.parse()</code> warning!

PerformanceAnything with regards to Next.js performance.Anything with regards to Next.js performance.

RuntimeRelated to Node.js or Edge Runtime with Next.js.Related to Node.js or Edge Runtime with Next.js.

Status: Open.

Documentation

#83183 In vercel/next.js;

· dincerpece opened on Aug 28, 2025

RSC content duplicated in response despite not leaving boundaries of RSC

PerformanceAnything with regards to Next.js performance.Anything with regards to Next.js performance.

Status: Open.

Bug

#82872 In vercel/next.js;

· cbovis opened on Aug 21, 2025

The chunks of the parent page are loaded in the child page

linear: nextConfirmed issue that is tracked by the Next.js team.Confirmed issue that is tracked by the Next.js team.

PerformanceAnything with regards to Next.js performance.Anything with regards to Next.js performance.

WebpackRelated to Webpack with Next.js.Related to Webpack with Next.js.

Status: Open.

Bug

#82787 In vercel/next.js;

· noreiller opened on Aug 19, 2025

Turbopack dev server uses too much RAM and CPU

linear: turbopackConfirmed issue that is tracked by the Turbopack team.Confirmed issue that is tracked by the Turbopack team.

PerformanceAnything with regards to Next.js performance.Anything with regards to Next.js performance.

TurbopackRelated to Turbopack with Next.js.Related to Turbopack with Next.js.

Status: Open.

Bug

#81161 In vercel/next.js;

· dokugo opened on Jul 1, 2025

Link and Image components rerendered when interacting with another client components (build only)

Image (next/image)Related to Next.js Image Optimization.Related to Next.js Image Optimization.

Linking and NavigatingRelated to Next.js linking (e.g., <Link>) and navigation.Related to Next.js linking (e.g., <Link>) and navigation.

PerformanceAnything with regards to Next.js performance.Anything with regards to Next.js performance.

Status: Open.

Bug

#80639 In vercel/next.js;

· robertPKO opened on Jun 18, 2025

Regression: next/dynamic conditionally importing client components adds both to client bundle in Next.js 15 (used to work in 14)

PerformanceAnything with regards to Next.js performance.Anything with regards to Next.js performance.

Status: Open.

Bug

#80234 In vercel/next.js;

· gonmpablo opened on Jun 6, 2025