You can configure which Snaplex a Pipeline, Task, API/Proxy will use in one of the following ways:

Only Snaplexes placed in the global shared folder are accessible in APIM. If a Snaplex is in a project or Project Space shared folder, then it does not display in the APIM Snaplex picker.

You can improve performance by running a parent and child Pipeline on the same Snaplex node because data is not transferred over a network.