Dear Nikos,
then it seems the issue is due to the low I/O performance of WSL2 in the /mnt directory (Why is WSL2 so slow? - DEV Community)
The workaround would be to run the simulation the your linux home, instead of the shared location.
The Linux file system is accessible from windows via \\wsl$ (https://www.howtogeek.com/426749/how-to-access-your-linux-wsl-files-in-windows-10/)
Cheers,
David