Actually, turning off acceleration, while it should yield worse performance, is solid trouble shooting for video overlay related issues. The fact that it didn't make it MUCH worse means they may be making a API call that my hardware isn't accelerating, and it's driver instead is passing it along to the CPU.
Task manager is the meter I'm looking at. Cubase's asio is not strictly a CPU meter...and it just jumps from 25% tp overs/glitches and back if you watch it during playback.
I have downloaded the latest nvidia drivers. Will install tonight, but even if that fixes this for me, this is something a good software dev will address if they can duplicate it. It's not like year old unified drivers should cause bug behavior like this. They can add that to their knowledge base, but they will want to address whatever API call they're making. If they're making DX10+ acceleration calls for a 2d instrument GUI, they should change the call. If it turns out its just some oddball card specific thing...might just suck to be me.