Specifications

MENU AND DIALOG REFERENCE
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D If you are using an ASIO driver specifically written for the audio
hardware, you can in most cases make settings for the hardware by
clicking the Control Panel button. This opens the hardware’s ASIO
Device Control Panel, which may or may not contain parameters for
adjusting the latency. Usually this is done by changing the number
and/or size of the audio buffers - the smaller the audio buffers, the
lower the latency. Please consult the documentation of your audio
hardware and its ASIO drivers for details!
D If you are running Reason on a Mac using the Sound Manager
driver protocol, you cannot change the latency.
OK, so why not just set the latency to the lowest possible value? The problem is
that selecting too low a latency is likely to result in playback problems (clicks,
pops, dropouts, etc.). There are several technical reasons for this, the main one
being that with smaller buffers (lower latency), the average strain on the CPU will
be higher. This also means that the more CPU-intensive your Reason song (i.e.
the more devices you use), the higher the minimum latency required for avoiding
playback difficulties.