Question on max connections

[hpntk]

Hey, love the setup you guys have provided. Running 3 machines behind the load balancer each with 2 Splash instances each. Quick question:

Do regular HTTP rules apply here in regards to how many active connections you can have? Say there are Splash requests going out to pull from site-b.com. And let's say I had multiple splash instances (on the same machine, so same IP) all requesting a page from site-b.com simultaneously. Would one or more of these connections have to wait until the active connection finishes?

I ask because I'd like to increase the number of Splash instances on each machine, currently they're only using about ~40% CPU. But just want to make sure I won't be negatively impacting the service, as many of the requests pushed through Splash will be requesting the same domain.