I'd just like to add that the problem with SX not recognising input and output latency properly is now gone and I no longer have the midi and audio offset that I had before. In fact my midi timing is the best I can remember it being...
Personally, I am never going to upgrade Cubase ever again, I am sick and tired of Steinberg freezing development of a particular version, leaving it full of BUGs with the only way out to pay them more money for an "upgrade". They've been doing that since the days of Cubase for Atari
stardust, i was having a few disk spikes (not Cpu) while running large projects, and i knew i had run it before fine, did a defrag and no spikes - i know it sounds well obvious but try it, it worked for me - it might help.