Want to run the multiple wcf service on the same machine

We have one wcf service hosted using window services. This service works as the server and can accept TCP connections. currently it works fine with 70 connections but when connections exceeds the service goes slower and new connections do not get established. So now on the same machine we want to run multiple instances of this wcf service owith its own configuration so that we can have more than 200 connections. Questions is if we add multiple end points in the service does it create two separate instances of services running in separate processes or thread? or is it same service instance accessed by different end points?