Performance tips for Vagrant

• Set memory to 1/4 of the host.
• Try setting more than 1 CPU core but measure what best works for you.
• Also enable IOAPIC if using more than one CPU core.
• Enable KVM virtualization if on a GNU/Linux host.

An example with these settings applied:

config.vm.provider "virtualbox" do |vb|
    vb.memory = "1024"
    vb.cpus = 2
    vb.customize ["modifyvm", :id, "--ioapic", "on", "--paravirtprovider", "kvm"]
end