Abstract: A processing device implementing silent memory instructions and miss-rate tracking to optimize switching policy on threads is disclosed. A processing device of the disclosure includes a branch prediction unit (BPU) to predict that an instruction of a first thread in a current execution context of the processing device is a delinquent instruction, indicate that the first thread including the delinquent instruction is in a silent execution mode, indicate that the delinquent instruction is to be executed as a silent instruction, switch an execution context of the processing device to a second thread, and when the execution context returns to the first thread, cause the delinquent instruction to be re-executed as a regular instruction.