nuxt: High CPU usage (200%) when running Nuxt dev server in Docker container

Environment

My host system:

- Operating System: Linux (Ubuntu 20.04 LTS)
- Computer:         Lenovo Legion 5 (32GB RAM, i5 10th gen)
- Node Version:     v18.12.1
- Nuxt Version:     3.7.0
- CLI Version:      3.7.2
- Nitro Version:    2.6.2
- Package Manager:  pnpm@8.1.0
- Builder:          -
- User Config:      devtools, vite
- Runtime Modules:  -
- Build Modules:    -

Reproduction

https://github.com/martinszeltins/nuxt-docker-cpu

Steps to reproduce the issue:

# Clone the repo
git clone https://github.com/martinszeltins/nuxt-docker-cpu.git
cd nuxt-docker-cpu

# Run the Docker container
docker-compose up -d
docker-compose logs --follow

# Wait for it to install dependencies and build the
# app (you will see it in the logs, it happens automatically)

# Run the Nuxt dev server
docker exec -it nuxt-docker-client pnpm run dev

Describe the bug

I have tried to keep the reproduction as minimal as possible, it is a fresh Nuxt app put inside a Docker container, nothing more. The issue that I am seeing is that the CPU usage is very high, fluctuating between 100% and 200%. This makes my computer’s fans spin up and it stays this way even when I am not doing anything. The app just stays open and does nothing and the CPU spins like crazy. To me it seems like the CPU should be close to 0% because nothing should be happening. When running a plain Vue / Vite app dev server in a container I did not notice this issue, only with Nuxt.

This happens only when running the dev sever in Docker, not locally. Maybe Nuxt has a problem with Linux or being run from a Docker container, I’m not sure. What is Nuxt dev server doing all the time in the background that the CPU usage is so high? 🤔 As soon as I stop the dev server, the CPU usage goes back to normal.

I did not know how to investigate this issue further because I don’t know the inner workings of Nuxt but it seems like some kind of resource leak is happening here. 🤷🏻‍♂️

Here is my CPU usage BEFORE I start the dev server:

And here is my CPU usage AFTER I have started the dev server:

Additional context

No response

Logs

No response