LRC slow with tablet functions but fine with mouse - Nvidia driver not being invoked

With the latest LRC version 14.1.1 and to a lesser degree earlier versions, tasks like masking did not work quickly or at all with my Wacom tablet (PTH-860).  Only if I lift the pen from the tablet and replace it onto the tablet (defocus-refocus) did it work - immediately. Everything has always been fast and fine with the mouse. All drivers (Nvidia, Wacom) are the latest.  I tried all variations of enabling and disabling GPU performance.  Starting LRC from the executable file does not solve the problem (not a corrupted shortcut).  I encountered some slowing with earlier LRC versions but this is pronounced and reproducible, with the pen and not the mouse.

What solves the problem is if I invoke LRC via the Nvidia app (optimized for LRC)....and only that enables the pen tablet to work as well as the mouse, without the need for defocus-refocus to be used each time for each action in masking and elsewhere.

Any thoughts on why LRC does not "see" the driver fully unless the optimized driver functions are started through the Nvidia app?