nginx supports tcp pipelining, however AFAIK it is not currently enabled for MBS.

At present the number of MBS calls per second actually made by e.g.Picard is

Max(1, 6 / MBS_response_time)

because the QtNetworkAccessManager used by Picard limits the number of simultaneous TCP connections to 6.

Enabling pipelining will have the following benefits:

a. Enable Picard and other clients to reach the 1 call per second current rate 

b. Reduce the number of simultaneous TCP connections made to MBS - reduced overhead, improved scalability etc.

(Or that is the theory - might need an experiment to confirm that e.g. throughput will be improved.)