These preferences let you choose the default size for plug-in windows and the view in which the workspace opens in Perform mode.
Show Toolbar CPU and Memory meters checkbox: When selected, the CPU and Memory meters appear in the center of the toolbar, along with the MIDI Status display. The checkbox is deselected by default.
Default size pop-up menu: Choose whether plug-in windows are displayed at their standard size (100%) or at a larger size.
Perform in Full Screen checkbox: When selected, Perform mode opens in a full screen view, rather than a window.
Disable screen saver in Perform mode: When selected, the Mac OS X screen saver is disabled when MainStage is in Perform mode.