CorelDRAW Graphics Suite X3 :: Importing Textures 300dpi - Reaction Slows Down Program

I'm working on a document with the necessary combination of bitmap and vector. After importing textures 300dpi (A4/24bit/jpg) the reaction slows down the program significantly, to the inability to continue working in it. Texture takes 40mega while in memory, but in my opinion it is not quite so much, it should not materially affect the normal operation. I am using CDrawX3, I tried to open it in a version 9 or 10. The fastest I came subjectively is CDraw Designer v10. But he still falls.I tried adjusting the amount of RAM for Corel or lower resolution bitmap import at 150 dpi. It's practically the same. It does not even mention the interactive transparency, or weld/trim operation, etc. I think, that the X4 or X5 are the same. Every year new version seems the same old software with the polished exterior. I'm used to work in Corel for technical drawings with lot of combination of bitmaps and vectors but unfortunately it will want to look for something else?