Navigation takes a few second up to a minute in production builds

[RemcoSmitsDev]

Summary

We have a dashboard application in next(15.5.4) that fetches data from an API that takes around 100ms.
We have a few buttons (next/link) that update the current URL only with a get parameter called start. Like so:

<Link
  scroll={false}
  prefetch={false}
  href={{
    query: {
	    start: props.start, // e.g. "-1 hour"
    },
  }}
  className={clsx(
    !props.isReset && "border border-gray-100",
    "select-none rounded-md px-3 py-2 text-xs text-gray-700 hover:bg-gray-50 hover:text-gray-500",
    props.currentStart === props.start &&
	    "bg-primary-100/10 !text-gray-500"
  )}
...

When we navigate using this link inside production builds, we see in our backend that the request already completed to fetch the needed data, but the page does not update. The strange thing is, it sometimes takes a few seconds or even a minute just to re-render/update the current UI. The UI is not complicated, it just a table that displays the raw data.

The strange thing is this does not happen all the time, sometimes it updates directly after the API fetch is done (like we see in dev builds).

We use the app router and our route structure is:

• [id]
  • somepage
    • [otherId]
      • page.tsx (has the start query parameter)

My question is: What happens here, and how could we fix this? Unfortunately, I can't share the project as it's an internal project. I'm also not able to reproduce this in a clean/new next app.

Additional information

Operating System:
  Platform: darwin
  Arch: arm64
  Version: Darwin Kernel Version 25.0.0: Mon Aug 25 21:17:56 PDT 2025; root:xnu-12377.1.9~3/RELEASE_ARM64_T6030
  Available memory (MB): 36864
  Available CPU cores: 11
Binaries:
  Node: 24.2.0
  npm: 11.3.0
  Yarn: N/A
  pnpm: N/A
Relevant Packages:
  next: 15.5.4 // Latest available version is detected (15.5.4).
  eslint-config-next: 15.5.3
  react: 19.1.1
  react-dom: 19.1.1
  typescript: 5.9.2
Next.js Config:
  output: standalone

Example

No response