There is a user who ran hundreds of REST API calls all at the same time. When doing this, everything was slow (e.g. login) until the REST API calls ended. Is there a way to throttle the amount of REST API user connections at one time?
Since the REST API uses the same settings as an actual user, you can set a maximum number of parallel connections on the user object itself. This is in the User tab under the "Session" on the right hand side:
This should prevent so many connections at once against the REST API Process.