Summary Load balancing of the Internet bank can be implemented by reduction of the workload of the bottleneck Web server. Load balancing improves both a performance of the computer system and the reliability of a server network. An evolutionary algorithm improved by introducing a tabu search procedure is discussed for solving multi-criteria optimization problem of finding a set of Pareto-suboptimal task assignments. A tabu mutation is used for minimization the workload of the bottleneck computer.