Latency has never been an issue for me on my Wersi. Probably the reason Wersi utilizes a fast CPU and decent amount of RAM. In addition OAS 7 does run a custom Scope card as its sound engine which has its own processors as well, therefore minimizing taxing of the PC's CPU.

Be advised... All VST's aren't created equal and some can be major CPU hogs taxing even the fastest CPU's. This is why you don't get crazy and try and run too many of these VST's in your system. Just because you have a VST host that supports 16 or more VST's, don't be foolish enough to believe you're going to run that many at once and not have issues, latency inclusive.