Same on
win10
i7-6700,
gtx1060
16 g ram
ssd.
Cull/select in PM6 is slower than PM5, and gets progressively slower. (lightroom like)
I run though culling in 6 then the same photos in 5. PM5 was much quicker.
I have culled/selected about 5000 images in past 3 days. So yes, have gone back to PM5.