Hi,
first, it will be depend on the clock cycle of operation of the microcontroller. It is not slow, rather some programmer program the microcontroller to have a security op-code first. for example, when the microcontroller receive the information wirelessly, it will buffer first then when it is done it will process and execute. the buffer time it take some time it is because the microcontroller will check the op-codes, body data and then the acknowledgement of receiving the data form its source. so that you can say its slow...