Chapter 4: Configuring Your Pro Tools System 29
To set the number of RTAS Processors:
1 Choose Setup > Playback Engine.
2 From the RTAS Processors pop-up menu, select the number of available processors you want
to allocate for RTAS plug-in processing. The number of processors available varies depending
on how many processors are available on your computer:
• Select 1 Processor to limit RTAS processing to one CPU in the system.
• Select 2 Processors to enable load balancing across two available processors.
• On systems running four or more processors, select from the available number of RTAS
processors.
3 Click OK.
CPU Usage Limit
The CPU Usage Limit controls the percentage of CPU resources allocated to Pro Tools host pro-
cessing tasks. Used in combination with the RTAS Processors setting, the CPU Usage Limit set-
ting lets you control the way Pro Tools tasks are carried out by the system.
Lower CPU Usage Limit settings limit the effect of Pro Tools processing on other CPU-inten-
sive tasks, such as screen redraws, and are useful when you are experiencing slow system re-
sponse, or when running other applications at the same time as Pro Tools.
Higher CPU Usage Limit settings allocate more processing power to Pro Tools, and are useful
for playing back large sessions or using more real-time plug-ins.
The maximum available CPU Usage Limit depends on the number of processors in your com-
puter and on the number of processors you specify for RTAS processing. This value can range
from 85 percent for single-processor computers to 99 percent for multi-processor computers.
Increasing the CPU Usage Limit may slow down screen response on slower computers.
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