In most cases, this is not a problem. It depends on the software that you are running as well as other processes that are running on your VPS and the hardware that your VPS has installed.
As you install additional licenses on the same VPS it is good to pull up the Task Manager and see the resources being used. You can check for applications/programs that are running that you may not need. You want to make sure the Memory is not over 70% despite what the CPU shows.
A high Memory load will cause your VPS to be sluggish and it will affect the trading efficiency. (see image below)
If you want to get technical you can also learn how to optimize MetaTrader 4 in an attempt to get more speed from your computer. Read Article
Get the most common VPS service that is reported to have good speeds, stability, uptime, and service.