We have elected to use noMachine for our Kali Linux Cloud Pentesting service due to it extreme performance over WAN .
Customers may elect to use noVNC which can be access by the cloud dashboard but using this will see low performance and latency.
If you want the best possible performance we strongly suggest downloading the noMachine client from the noMachine website and install it. noMachine allows you to shared files from your local PC to the Kali VPS which will be very handy when transfering scripts and other data.
We have pre-installed the noMachine server software so all you need it the client and the noMachine client is available for all operating systems.