I have a high end graphics processing unit (gpu), or graphics card, on my pc and it does little or nothing for loading and/or processing photographic images. Most gpu's are designed for 3d imaging, and photo images are 2d with very few exceptions.
Most programs today work the cpu and memory harder than the gpu, and the reason is program developers know that most of their users don't have a gpu, but they do know you have a cpu and memory.
-- As noted, focus on how much memory your system has.
-- How old is your system?
-- how big is the hard disk drive?