GEANT-4 is a widely-used simulation program used to simulate particle interactions. There are currently several members of McMaster's Engineering Physics department that use the program, and are being limited by the performance of the software. This means that they cannot simulate particle interactions that take place over the course of minutes (or even seconds), and they also can't simulate large numbers of particles.
Increasing the runtime of the simulation or the number of particles would greatly increase the accuracy of their results, allowing the researchers to understand the systems they're modeling better. This is especially true when modeling complex systems, such as McMaster's nuclear reactor. Depending upon the level of success of the project, the solution could potentially benefit groups that use GEANT-4 outside of McMaster as well.