Automated Builds in single server Azure devops server

If i'm deploy azure devops server on single machine, why extensive use of automated build, test, or release likely will cause performance issues ?

thanks!

A single-server deployment consists of a single machine and it likely will cause performance issues because of the following reason:

• Limited size of RAM. For evaluation or personal use - 2 GB, scale up to 250 users - 4 GB and scale up to 500 users - 8 GB.

You can refer to Requirements for Azure DevOps on-premises