P: Slow UI when using Mac and Custom Display Profile

Not all of us have that option. Still not sure what combination of hardware and OS gives you that option

Mac OS for many years has. Click Get Info (Command i) on the application icon. 

@DYP I wrote 2019 iMac 5K but forgot to mention that the OS is Catalina, sorry.

@Alexander 

Not all of us have that option. Still not sure what combination of hardware and OS gives you that option. All I know is I do not have that option.

In my case, the problems with Lightroom v10.x performance on my 2019 5K iMac go away when I set the app to "Open in Low Resolution".

It's ugly (even with the fonts set to "Large" in the LrC preferences, the fonts are very small and a challenge to read in Low Resolution Mode) but it works... uhm... yay? 🙄

Bonus: zooming to 100% is actually useful to properly inspect detail quality that way.

*DOUG LANDRETH  Use the second monitor for the leap with sRGB and the profiled monitor with the custom profile  for editing. Thats just a workaround. But it will work more or less till adobe will fix this.

+1 for this post *DOUG LANDRETH 

What a nightmare!

I have this issue as well.  I'm running Lightroom Classic on a Mac Pro (Late 2013) with 3.5 GHz 6-Core Intel Xeon Ef with 64GB Ram and the AMD FirePro D500 Graphics Card w/3GB Ram.

I'm using a BenQ SW271 Display with a NEC PA272W as a second monitor.

I calibrate my monitors with the Xrite i1 Pro3 Calibrator and use these custom profiles for my monitors.  The colors are right on but it appears that they might be the cause of the problem with Lightroom Classic V10 being unusably slow after the upgrade from 9.4.

Some suggest reverting to the previous version of LR Classic, however, it's my understanding that the catalog created by V10 is not compatible with 9.4, so all of my work (and there's a lot) since upgrading to V10 would be lost, and I'd be forced to use a 9.4 catalog backup that's missing all the new work, so that's not a possibility.

Using a generic profile such as Adobe RGB would defeat the purpose of color management and wouldn't be an acceptable solution.

I'd love to know if there's been any progress defining and solving this issue.  It's extremely aggravating. 

Since stumbling upon this bug, I've been wondering why using the standard sRGB profile avoids the slow-downs, while the Adobe RGB profile does not. Can anyone in the know share some insights on why this is?

Since the gamut of my displays slightly exceeds that of Adobe RGB, I'd be much happier to use this profile rather than sRGB for the time being...

No slowdown on my windows machine and considering how little work is involved with updating a XMP, can't see how it could be any different on a Mac. 

Thanks... Autowrite XMP slows down Lightroom like molasses when working with complex edits. I usually end up editing like 3-4k images in a day and I tried turning that on, but it just wasnt bearable. 

I did take a backup before upgrading to LR10. But I did so much culling and edits across 5 projects, that it was a sheer pain to downgrade. 

I have been following this thread for a while. While I know, I can figure out workarounds with deep troubleshooting, I simply to not have the time and nor the patience to do so.