If you are using Vagrant and facing performance hits while running web-server or unit tests, the solution can be using NFS. It is used for sharing folders between host and guest machines.
Vagrant uses VirtualBox default sharing mechanism, which is very slow. After you'll switch to NFS, file access speed will increase by ~ 10 - 100 times.
On your local machine do
$ sudo apt-get install nfs-kernel-server nfs-common portmap. This comes pre-installed on Mac OS X 10.5+ (Leopard and higher).
Inside your Vagrant box (guest machine) do
$ sudo apt-get install nfs-common portmap
:nfs option to
true when configuring shared folder(s).
config.vm.synced_folder "v-root", "/vagrant", :nfs => true
NFS requires Private network, so you need to switch to it, in case you are using other network options, like
:public_network (i.e. bridged).
config.vm.network :private_network, ip: "10.11.12.13"
Grabbed from here.
VirtualBox Shared Folders: 5m 14s Host File System: 10s Native VM File System: 13s NFS Shared Folders: 22s NFS Shared Folders (warm cache): 14s