Use only 1GiB of memory per node
Define 4 VMs in one Vagrantfile
Make points to cover a bit more precise
Add steps to activate Erlang
Slim down the provisioned stuff for now
Setup another DHCP network
Speed up provisioning
Use euc2014 recipe
Don't include build-essential recipe (speed)
Use static IP addresses
Use binary packages with ESL Erlang
Use static /etc/hosts
Install Tsung from GitHub
Install MongooseIM from source