Speed ​​and response CorelDraw X6_64bit

For serious work on 2D technical graphics are other programs with greater efficiency and support hw (Autocad, etc.).
When drawing fills with data, layers, transparency, increase the file causes sharp slowdown and response. It is not so great, now has about 12MB. I am a long-time user, I know CDraw since the first versions. With the release of the new expect to finally proclaimed speed, which is unfortunately doesn't happen. It's a marketing gimmick for people to keep upgrading outdated software? I tried Designer Technical Suite X6_64, with the same result. I did not understand CorelCAD, what is actually? Even if Corel is satisfying me for many reasons. Does anyone have anything to say?
thanks for the response
Peter