Use the kvm paravirt provider if Virtualbox >= 5.0.0

README.md

@@ -32,6 +32,7 @@ Before launching your Dashbrew environment, you must install VirtualBox and Vagr
 
 * [Vagrant >= 1.6.5](http://www.vagrantup.com/)
 * [VirtualBox 4.3.x](https://www.virtualbox.org/)
+	* Note that installing Virtualbox 5.x is *strongly* recommended for better performance.
 * [Vagrant Hosts Provisioner plugin](https://github.com/mdkholy/vagrant-hosts-provisioner) for managing the /etc/hosts file of both the host and guest machines.
 	* ``$ vagrant plugin install vagrant-hosts-provisioner``
 

Vagrantfile

@@ -29,6 +29,15 @@ Vagrant.configure(2) do |config|
     vb.customize ["modifyvm", :id, "--cpus", "1"]
     vb.customize ["modifyvm", :id, "--natdnshostresolver1", "on"]
     vb.customize ["modifyvm", :id, "--natdnsproxy1", "on"]
+
+    # If Virtualbox is version 5.0.0 or higher, enable the kvm paravirtualization
+    # provider for better performance.
+    begin
+      if VagrantPlugins::ProviderVirtualBox::Driver::Meta.new.version >= "5.0.0"
+        vb.customize ['modifyvm', :id, '--paravirtprovider', 'kvm']
+      end
+    rescue Vagrant::Errors::VirtualBoxNotDetected
+    end
   end
 
   # Synced Folders