generateStaticParams slows down dev

[rijk]

Verify canary release

• I verified that the issue exists in the latest Next.js canary release

Provide environment information

npx next info

    Operating System:
      Platform: darwin
      Arch: arm64
      Version: Darwin Kernel Version 22.2.0: Fri Nov 11 02:06:26 PST 2022; root:xnu-8792.61.2~4/RELEASE_ARM64_T8112
    Binaries:
      Node: 16.18.1
      npm: 8.19.2
      Yarn: N/A
      pnpm: 7.22.0
    Relevant packages:
      next: 13.1.2-canary.1
      eslint-config-next: 13.1.1
      react: 18.2.0
      react-dom: 18.2.0

Which area(s) of Next.js are affected? (leave empty if unsure)

App directory (appDir: true), Data fetching (gS(S)P, getInitialProps)

Link to the code that reproduces this issue

• (can provide if necessary)

To Reproduce

Have a tree with quite some static paths. For me it is:

• Level 1: 8
  • Level 2: 160

So in total 1280 paths.

Describe the Bug

Loading pages (especially from level 2) is excruciatingly slow in development:

I had to work around it by doing:

export async function generateStaticParams() {
  if (process.env.NODE_ENV !== 'production') return []

  // ...
}

Then it's:

Expected Behavior

I don't see the need to block rendering in development, as these paths are not statically generated anyway. So it would be nice if Next did this if (process.env.NODE_ENV !== 'production') skip automatically.

Which browser are you using? (if relevant)

No response

How are you deploying your application? (if relevant)

No response

[github-actions]

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