Plugins seem to take up CPU power regardless if there is any audio passing through. This can mean resources quickly get used up. Pro Tools has a great feature called "Dynamic Plug-in Processing". When audio is being processed by the plug-in, it uses CPU power as it normally would. But when no audio is being processed by the plug-in, it ceases to use CPU power. That CPU power can then be allocated to another plug-in or process as needed. The result is much higher CPU efficiency for the system. Large sessions take up much less juice than when using Studio One. This is the only thing keeping me with Pro Tools.