Manage the number of services running on servers


I’m installing drone on 5 servers. I have 4 servers for agents and 1, lightest, for the server. When services run, it runs on any of the 5 servers. I didn’t understood how the server is chosen but, when there is too much services that run on the lightest server, it become very slow.

Is it possible to limit the number of services than run on a specific server?