> Inside a container the file system is very slow
Because you are not using "a container".
You are using a container that happens to be running in a linux VM on your OS X laptop. It's not the containers fault, it's the entire virtual machine that you are running because you're trying to run technology built on top of one operating system while running a completely different one.
I find it sad that many people use Docker, but the majority of them run Linux in a VM inside an expensive proprietary platform to do so, sometimes without even realizing it.
Meanwhile, the Linux desktop ecosystem is deteriorating and should be used more and receive more financial support.
it seems like everybody here is using Macs for development to the point that if you don't say you aren't, you are assumed to be on a mac. Windows with WSL2 is actually pleasant to use, I can recommend trying it out. while WSL2 is a VM technically, the level of integration makes it basically native (if you use the VM disk for your workspace, which you should.)
Yep, if you try to build something that is stored on /mnt/c you'll have the same horrible performance.