Hello.
Tell me what the problem may be, after several restarts of the program (DraftSight 2019 x64 SP3) when moving along the drawing (on the canvas itself) with the "hand", the smoothness disappears, the image seems to slow down. The same effect was used on Windows 7 and now on Windows 10 Pro build 1909. The operating system is freshly installed, the drivers are all up-to-date, and the problem appears after several Draftsight launches.
It looks like this:
SolidworksDrawings And Detailing