There is a significant growth in the use of the current intelligent and portable devices such as smartphones, laptops, and tablets that result in several network interfaces and various potential paths for communication. However, the mechanism used today via the Internet uses only one path for a communication session. This paper presents multipath throughput tests for the MPT network layer multipath communication library, a novel and promising solution for real-time transmission based on GRE-in-UDP encapsulation that provides an IPv4 or IPv6 tunneling (logical interface). We investigate the efficiency of channel capacity aggregation of MPT in dealing with physical paths via wired channels and test the cases when the physical paths have the same speed or radically different speeds.