Hi, 3DSSupport asked me to post this here. I too am having issues with mouse lag in the drawings area of Draftsight 2015 SP2, making it unusable.  I went back and re-read the min. requirements very carefully to try to eliminate any errors on my part.  I am confused by the '32bit' at the end of the "system requirements - Ubuntu 9.10 Gnome, Fedora 11 Gnome, KDE, or higher versions (others in progress), 32bit". I have tired loading SP2 onto 32bit Ubuntu Gnome 14.04.2 LTS and it says "wrong system architecture" leaving me to conclude that SP2 is complied 64bit. It installs fine on the 64bit OS. The hardware is standard Dell Dimension 5150 with 3GB RAM Dual 2.80GHz Pentium processor. Finally what I can't fathom is that this has been an issue for 4 wks and I can't see a single post here from the guys at 3DS with any suggestions or fixes.  Guys we are relying on you, please don't leave us in the cold/dark.