it could just be the driver, the suggested driver in the release notes for visualize is NVIDIA driver version 354.56 try that and see if it improves things.
I would also advise you make a note of the driver you are on currently using and/or create a system restore point so you can easily revert back to the old driver if needed.
Hi Alan, hi Brian
yes...it was only the driver version. Now it works very fast!