To solve the latency issue, most PCs will need to have asio4all installed. See http://www.asio4all.com/ for details.

When I first installed Pianoteq, this was the issue. After installing asio4all, the latency was gone to the extent that I could turn the volume up on the onboard processor and there was no difference in time between the onboard speakers and the bookshelf speakers coming out of the notebook.