Slow route compilation -> Next15

[Icegreeen]

Summary

I'm working on a Next application and I'm having the following compilation problem:

"react": "^18",, 
"next": "^15.0.2",

Problem: all application routes in the dev environment take a long time to compile, some take 15 seconds to navigate, giving a stuck experience, see an example in the image below. This problem is on all routes, and only in dev environment.

Detail: backend routes respond 4 times faster than the next server side route itself

Clarification: All these pages are well optimized, no package is heavy, the problem seems to be in the compilation itself.

Packjson:

"scripts": {
    "dev": "next dev",
    "build": "next build",
    "start": "next start",
    "lint": "eslint . --ext .ts,.tsx",
    "prepare": "husky install",
    "analyze": "ANALYZE=true next build"
  },

My next.config.mjs:

/** @type {import('next').NextConfig} */
const nextConfig = {
  experimental: {
    turbo: {},
    optimizeCss: true,
  },
};

export default nextConfig;

I have already tried to use the turbopack but without success.

Additional information

No response

Example

No response

[icyJoseph]

Do you maybe have some sort of circular dependency, or JSON's being loaded? top level code that's being executed?

For circular dependencies you can try madge with the -c flag.

Have you build a bundle analysis output, through @next/bundle-analyzer