12.25

OPTIMIZING PERFORMANCE621
Optimizing your computer system
In this manual we do not have the possibility to give you detailed procedures for optimizing your computer for maxi-
mum power. This is a subject that we could write complete books on. However, there are a couple of very useful
things to check and adjust.
About Multi-core processors
When you’re using a multi-core processor, such as a dual-core or quad-core processor, Reason will take full advan-
tage of this in a very sophisticated way. Similarly, if your computer has several multi-core processors, Reason will use
the full capacity of these to enhance the performance.
If your computer has one or several multi-core processors, Reason automatically detects this and automatically en-
ables the “Use multi-core audio rendering” function on the Audio tab in Preferences:
If you are working with a song document which has one single, very long and processor-heavy serial audio chain -
and only a few devices that process the audio in parallel - you could try and deactivate the multi-core audio rendering
option. This might enhance the performance in these special situations. However, under normal circumstances multi-
core audio rendering is always the best option performance-wise.
About hyper-threading audio rendering
Hyper-threading audio rendering could improve the performance even further. Note that this depends on your com-
puter’s CPU and other hardware, so there is no guarantee the performance will improve. If you are experiencing per-
formance problems, try activating or deactivating this to see if the performance improves.
About audio rendering using the audio card buffer size setting
The “Render audio using audio card buffer size setting” function should be selected (checked) for best plugin perfor-
mance. When selected, the audio batches are rendered internally according to the set Buffer size (see “Making Buf-
fer Size adjustments in the Reason Preferences dialog” above). For example, if you have a Buffer size of 512
Samples, each audio batch will be 512 samples internally. Raising the Buffer size will let Reason process larger audio
batches in one go, which is often more efficient. Many plugins are also more efficient when doing larger audio
batches. if you are using DSP-heavy VSTs (mastering effects, for example), these will run a lot smoother with this
function selected.
! Note that old songs might sound different with this function selected, if the songs uses feedback routings and
CV connections.
If unchecked (off), all audio batches are rendered internally at a fixed size of 64 samples - regardless of the Buffer
size setting. This might be desirable if you are using feedback signal routings and CV connections in your songs, and
want the internal latency of those connections to be fixed at a short value all the time. This might result in perfor-
mance problems for DSP-heavy VSTs, though.
Unchecked will give the same performance as in previous Reason 10 versions.