Vagrant box take long time to access shared /vagrant folder

Question

I have a vagrant box running on windows 10 hyper-v

config.vm.box = "kmm/ubuntu-xenial64" #A standard Ubuntu 16.04 LTS (x64).
config.vm.provider "hyperv"

Just after provisioning it, it seems to be running o.k. but then if I exit and ssh back to it then trivial actions such as pressing tab after typing cd /vag would take tons of time (e.g 30 sec or more) and after that a cd /vagrant worked o.k. then ls -la worked o.k. and another ls -la took something like 3 minutes or so.

During that time hyper-v is showing the virtual machine at 0% CPU.

Any suggestions on where I should look to try and figure out why is this happening?

Answer 1

It seems ther reason for this was that the SMB connections would disconnect. using

net config server /autodisconnect:-1

in a "run as administrator" command window fixed it.

as explained here: https://www.vagrantup.com/docs/synced-folders/smb.html#preventing-idle-disconnects