P: Slow UI when using Mac and Custom Display Profile

Sorry, Bill. I am getting a little upset too. I had posted the issue also and for one day I thought it had gone by changing resolution of the display. For any unknown reason the temporary performance boost disappeared again and I am struggling with the same performance issues again. But - and I can imagine others feel in a similar way - at some point in time you just get bored and tired and stop complaining, because - and I would love to see a change in communication from Adobe - you don't get the feeling that Adobe is really listening. An update here and there that the bug is being worked on, or questions back to the community or request for help - that is missing.  I have a MBP16 and latest LR and Big Sure - nothing outdated. Also, I have once followed all steps for a different bug - to test and reinstall and do this and that - we hear the same advises over and over again for all kinds of problems, but if you read the posts you realize that others tried this as well without success. Pushing customers to reinstall, reconfigure keeps them busy for a while or at some point in time they stop complaining, maybe stop posting issued and after a while they simply may have gone to competition.

I loved LR since the very first days and I am sure most users do like the concept and interface. Still, many don't request tons of new features and miss performance of older versions running faster on older hardware. 

I remember the day where Adobe product management rolled back after some not thought-through changes in the import interface after lots of users complained. Some recognition of customers and maybe some more update regarding status of bug fixing in case of issues which professional photographs drive mad - luckily I do not depend on LR for my work, but if would, I would be mad as well. So I will keep fingers crossed and hope we get this issue fixed soon.

I recognise the endless efforts of Adobe reps bridging customers and product management , it is a tough situation sometimes and I thank them all for doing their best in bringing our voices into the teams. I know how difficult it can be working in a company dealing with similar sized software projects.

This thread is being merged into an existing thread for better tracking and response.

Yea and I am running an old 2019 MacPro.

I know - Catalina‘s been ‚antiquated‘ since November... :)))

Your rejection of evidence is sad. 

Here we go with your BS again about antiquated versions of macOS and Mac hardware.

That is simply not the case. 

You expect Adobe to test on literally millions of combinations of hardware and software? This means that you are willing to pay $thousands per month for a Lightroom license.

Have you noticed that only a tiny percentage of the Lightroom customer base is having significant issues? We are not seeing tens of thousands of complaints across the various photography and Apple forums. When I search other sites, I find the same people posting on multiple sites. 

Further examination of the posts on this site show that the majority with issues are running antiquated versions of macOS and Mac hardware.

got it but maybe adobe should not release updates until they are sure they will work for everyone and yes I have an IT guy I can consult with, many others are having the same issue.

Did your IT department approve your upgrades? Oh, you don't HAVE and IT department? Did you ever see a corporate computer user without an IT Department (onsite or off)? You are your own corporation, get an IT department (there are probably inexpensive options within 50 miles)! If I was your IT, (and for 25 years, I was a Mac IT Pro), you would NEVER have moved to either Big Sur or LR Classic V.10...yet. Be conservative in your device upgrades, look hard before you leap!

I'm not trying to rub it in, merely suggesting "act like a company".

Depuis cette grosse mise à jour qui m'a emmenée vers Catalina je n'ai que des problèmes.

Tout d'abord mon Mac est très ralenti dès que j'ouvre un fichier Adobe et Ligthroom est devenu un cauchemar.

J'ai un Pentax K1 et je travaille en RAW jusque là je n'avais aucun problème mais à présent il peine à importer, la retouche est extrêmement lente, chaque action se fait au ralenti et à présent lorsque j'exporte mes photos il s'éteint et la relance est extrêmement lente.

Je ne vois pas comment je peux continuer à travailler dans ces conditions !

Si vous avez quelques conseils je vous en serai reconnaissante.

Google Translate: 

Since this big update that took me to Catalina I have only had problems.
First of all my Mac is very slow when I open an Adobe file and Ligthroom has become a nightmare.
I have a Pentax K1 and I work in RAW until then I had no problem but now it struggles to import, the retouching is extremely slow, every action is done in slow motion and now when I export my photos it s 'off and recovery is extremely slow.
I don't see how I can continue to work under these conditions!
If you have any advice I will appreciate it.