In order to adapt to the rapid development of IoT technologies based 5G, the idea of using the ARM architecture as a terminal device for IoT has important practical significance. However, it is still unclear whether the ARM architecture can meet the 5G IoT terminal performance requirements. In particular, the processing delay of terminal for massive data will directly affect its feasibility.In view of this, based on the open air interface(OAI), this paper focuses on the Turbo decoding delay problem using the ARM architecture and compares it with the x86 architecture computer.The results show that the decoding delay based on the ARM architecture is 20%~25% longer than that of x86 architecture. Given the difference in the performance of the two architectures, this gap is in line with expectations.