no, that is not the core problem - the core problem that even with supported GPU/drivers the performance is horrible vs what it should be, based on how some other GPU enabled applications are doing...
I actually have pretty darned good Lr performance, even with a 4K screen; certainly usable.
However, I found that AutoPano demanded a graphic upgrade:
I upgraded my display to an NEC PA322UHD 4K one. AutoPano Giga 4.0 became painfully slow, especially the editing window. I downsized the window and that helped, but not much. Then, to get 60Hz refresh on my new monitor, I upgraded the graphics adapter from an AMD V4900 to an AMD W5000. Then I tried to stitch again. What a difference! It’s now much faster than it was before going to the 4K display. This is not a super high end GPU, but it sure makes a difference!
Configuration: Win 7 x64, 2x Hexcore Xeons @ 3.33 GHz, 256GB RAM, 192 GB used by OS, 128 GB used by AutoPano. W5000: 2 GB, GDDR5, 800MHz memory clock. This is a workstation-grade configuration.
Jim