A system for processing user input includes an input device, an input processing unit, a high-latency subsystem, a low-latency subsystem, input processing unit software for generating signals in response to user inputs, and an output device. The low-latency subsystem processes signals corresponding to at least some events and generates corresponding programmable low-latency output, the programmable output being based, at least in part, on state information being maintained by the high-latency subsystem. The high-latency subsystem processes signals corresponding to at least some events, and generates corresponding output, the output of the high-latency subsystem being higher latency than the output of the low-latency subsystem with respect to a given event.