Mixere typically uses less than 5% of the CPU. However, if you have many documents open, or if your documents contain many tracks, or many automations, CPU usage can increase substantially. If CPU usage becomes a problem, here are some things to try:
- Reduce the slider display smoothness, using View/Options/Sliders; for details, see Options.
- Delete empty tracks from your documents.
- Open less documents at once.
- Uncheck the "Show window contents while dragging" system property (Settings/Control Panel/Display/Effects); for details, see Resizing Columns.