I read the related thread before, today I tried the Lightroom version 6.9 as well as the LIS 3.4, the Lightroom reacts very slow I think mainly due to the transferring image to Lightroom using the 3.0 USB cable ( I used the Leica supplied one).
the LIS 3.4 were just ok.
what is your experience on the tethering? anyway I can make Lightroom run smoother ? or you have better alternatives?