Use NFS for the shared folder because it dramatically decreases latency for git operations.

Vagrantfile

@@ -97,6 +97,8 @@ Vagrant.configure(VAGRANTFILE_API_VERSION) do |config|
     config.hostsupdater.remove_on_suspend = false
   end
 
+  config.vm.synced_folder ".", "/vagrant", type: "nfs", mount_options: ['rw', 'vers=3', 'tcp']
+
   # Otherwise, you can access the site at http://localhost:3000
   config.vm.network :forwarded_port, guest: 80, host: 3000