If your server still has a lot of free CPU cycle, the method you want to try first will be vertical scaling, which multiple server cluster members work in parallel to process the incoming messages.

The paper presents the work cycle and velocity election of a vertical broacher controled with single chip microcomputer 8031.

Then, transient response of vertical displacement, vertical stress and pile-soil stress ratio of some nodes in the elastic subgrade are computed in one single load cycle.