Also, for people having CPU problems... stay off the 64 buffer guys. You really don't need to go that low and with heavy projects, it is asking for trouble, even on high end machines. 256 is responsive enough. At least, for me. If you are really sensitive, 128 will do the trick. I've personally never needed to go to 128.
Alas, it's a shame I can't use higher dropout protection settings. Record enabled track on a buffer of 256, the rest on a higher buffer, which was the intention of dropout protection. The doubling of the CPU usage, however, renders this completely moot.
I hope Presonus one day takes a look at this and refines it. As it is right now, using it is no different than upping the buffer yourself when you start mixing. It might work with tracking live instruments and vocals, but it certainly doesn't work as advertised with VSTi's.