The control cycle of the Plasma Control System(PCS)currently is 100μs and the delay could reach to 80μs due to the data transfer and the inadequate cooperation among different CPUs. However, the delay in theory is within 15μs, so the loads of all the CPUs need to be balanced in order to reduce the delay and improve the performance of this control system. In addition, with the multi-thread parallel technique and shared memory, the time-consuming process of reading data from RFM can run in parallel with the main process, which could shorten the control cycle to 50μs and the delay to 30μs or less. Therefore, the efficiency of PCS could be highly promoted and the reduction of unnecessary delay could prevent PCS from becoming the bottleneck of the whole TOKAMAK control system.