could you tell me the video card you've mounted?
Try turning off the GPU acceleration
Preferences->Performance->uncheck "Use Graphics Processor"
this product should not have been rolled out without extensive and confident testing
You assume that your personal experiences indicate more than they actually do. Lr works just fine (and very quickly) for many (most?) of us.
In the meantime - do what DJ suggests.
There is a known issue with some AMD cards explained here: Photoshop crashes in Camera Raw or when using Lightroom | Windows don't let the title confuse you as the Develop Module is Camera RAW and it is problems with the 5xxx to 8xxx series.
Please follow dj_paige's suggestion. This should fix the crashing. You will not miss out on anything as the gnu acceleration only speeds up a few actions in Develop and actually significantly slows down others if you are not using an extremely fast graphics processor in comparison to the main cpu.