I upgraded from Lightroom 4.4 to 6. Everything seems so much slower. In 4.4 I was able to switch between photos in both the Library and Developer modules and have the image load in about half a second. Now it takes about 2-4 seconds for Lightroom to even recognize that I am trying to go to the next image. I have tried disabling GPU acceleration, but it doesn't seem to make a difference. I have the newest generation i7 with 16GB of ram and an SSD. I was monitoring CPU usage and it never really goes above 50%. Is there anything I can try to make it speed up?
Just ran an unscientific test. Rendering a 1:1 raw took eighteen seconds on lightoom 6 and seven seconds on lightroom 4.4
Not sure if this will help, but go to:
and make sure the box is selected for "Use Graphics Processor."
I hope this works for you