I am not seeing any performance issues, and everything is working. You must buy the license to use it, but the 30 day trial is enough to give you an impression of what it can do. I am pretty sure that an early beta version of Logitech's new G-Hub software stuffed Lazy Nezumi Pro. Its called Lazy Nezumi Pro, and can be found here.

Other apps that offer line smoothing are Paint Tool Sai (purchased license) and Krita (free, open-source and packed with helpful goodies). I had to do a clean reinstall of Windows 10 to get past that. G-Hub is now on full release, and the current version seems to be problem free so far for me. There still a few issues reported on the Logitech forums though.

Lazy Nezumi Pro V15.7.3 Build 1740 Cigol License Key Filter Serials In normal mode, works as a plug-step wizard, where all parameters are set automatically and you need only select the desired option from the results of the two images. I hope this might help someone down the road.