I upgraded to PM6 the instant the upgrade notification popped up in PM5 because I use PM on several thousand images per day.
More enticing than anything was the promise of 3x speed improvement.
However, when I started using it PM6 had noticeably slower performance going between images. (I am not having severe issues like the first person who posted in this thread, i.e., definitely not 2-3 seconds. If that were the case I could not use PM6 at all for my work. So whatever serious issue is happening there is probably not happening for me.)
But the bottom line is that PM6 for me is unquestionably about twice as slow as PM5 after a couple of days of heavy use and getting used to it. I've tried the same settings as for PM5, then giving more cache and memory, then less. The effect of those changes seems minor, but overall it's just very noticeably laggy compared to PM5.
It possibly might have gotten imperceptibly faster than it originally was. Or perhaps I'm just getting used to it and the initial slowness shock has worn off.
However, regardless of my minor perceptions about changes in PM6 speed from first use until now, all the time compared to PM5, PM6 is about 2x slower in simple culling operation (meaning going to next photo, typing 1-5 to rate, going to next photo, etc.), as I mentioned above.
This increased lag in PM6 is all the time. It doesn't matter if it's a new folder or one that I've already loaded and gone through before.
It is not unusable, and it is much faster than the other person who said it takes 2-3 seconds to advance to the next photo.
It's more like half of a second now instead of a quarter of a second before.
Are there any suggestions on changing settings to get PM6 to be three times faster as promised?
On a separate note, there are WAY too many grid lines in the crop tool of PM6. It obscures everything underneath and makes it only possible to rotate crops looking at objects outside of the crop area to help line up the rotation of the crop. So basically the purpose of the grid lines to help line up things near the center of the crop is being canceled out because there are way too many grid lines. Simple rule of thirds lines would be plenty. I'm sure there's a preference to get rid of the lines, but the lines definitely should not be the default if there are so many of them.
Other than performance and grid lines PM6 seems really solid to me so far. Good work, Kirk.