XPS 15 9560 excessive audio latency with WASAPI or ASIO applications

I am using real time music/audio applications on my 9560, and notice that there is excessive audio latency.  A typical application will use either ASIO, or the native low latency Windows driver - WASAPI.  To use ASIO, I need to install a 3rd party driver such as ASIO4ALL, I don't need to install anything extra in order to use WASAPI.  The high latency occurs for both ASIO and WASAPI. 

I found a workaround: remove the Dell supplied audio driver, and replace it with the generic Windows "High Definition Audio Device". Latency is now back to a very good (low) level. I have been using these applications for many, many, years, and this is the first time I have encountered this problem. In my opinion - there is something very different about this system - I have never had to do this before. 

The application I am testing with at the moment is Pianoteq  It may or may not be relevant, but I found another example of a user with latency problems - this user was using a game called Rocksmith, and they took the drastic action of returning the laptop!! Here is the discussion: https://forums.ubi.com/showthread.php/1668470-Audio-delay-on-Dell-XPS-15-Forums (I am posting there as GregS148)

Should I post about this problem on a Windows 10 forum as well?