Never tried (So I shouldn't answer) but I guess 3 things that make me thinking: don't waist too much time on that:
1- you will not pay more because you open different Client ID.
Client ID is a way to insulate some order processing methods etc ... it's a context intent feature, not a connection intent feature.
2- What is important is number of open socket to the server, and as you can only open one by server (that I know) ClientID doesn't help you.
Caveat:
On one machine you theoretically can open 4 sockets but on 4 different servers, by running GT+TWS with Paper and Real , BUT!! you will need as many different IB account as you want simultaneous connections.
?not worth the trouble.
3- You will not get better data rate, because with just a single connection you can (you will most assuredly) easily hit pacing limitations.
Thing like (but that is not the only one)
Theses limitation are aggregated at GW level or even worst if using TWS as it also involved what TWS displays. IB give you some slack on that but that's only slack, not commitments
Pacing limitations can be raised buying connection packs but even so IB have a ceiling on that.
In short:
Try first, because I will be surprised that connection speed will become your main issue.
