Optimization of energy consumption in Elevator Group Control System (EGCS) has become a concerning issue due to the global energy crisis. To resolve this concern, only a handful amount of approaches, based on swarm intelligence, have been implemented. For this reason, this study implements and analyzes the energy-saving EGCS based on two popular metaheuristic algorithms: Particle Swarm Optimization (PSO) and Genetic Algorithm (GA). The performance analysis of these two algorithms in energy-saving EGCS reveals that both of the algorithms have some pros and cons. While PSO can optimize energy consumption much better than GA in most cases, the trapping in local minima or pre-mature convergence of PSO makes its performance worse. GA, on the other hand, is unable to reduce energy consumption in EGCS to a considerably lower level. However, the average energy consumption and standard deviation of GA are superior to that of PSO. In the case of computational time, PSO outperforms GA, which makes PSO a popular choice where faster computation is required.