the ‘opt max Throughput’ scheduler maximizes the sum throughput over all possible schedules. This is done by exhaustive search over all possible user allocations. For a bandwidth of 5MHz and a number of 5 users, the number of possible schedules is quite huge and the simulation will need a lot of time (in the order weeks). To my experience the biggest simulation setup feasible on a PC is 3MHz of bandwidth and 3 users, and even that will take a lot of time (maybe days). However, the approximate maximum throughput scheduler also leads to good results.