P: Slow UI when using Mac and Custom Display Profile

@louis_brunet Yes it is, but of course you can't use the same library files. And, you can have both open at the same time. One thing to be aware of is that they will share the same preferences, which I have not found to be a problem. Things like the GPU setting will be the same for each.

Before install 10.0 make sure you have two copies of the 9.4 folder. Of if 10.0 back to 9.4 make sure you have two copies of the 10.0. You can copy them some where else and the copy them back to the Application folder. Just rename the folder Adobe Lightroom Classic by adding 94 to the end of it and 10 to the 10.x folder.

Unfortunately, no. Whereas it is possible with many other Adobe applications, like Photoshop, Illustrator, InDesign… I don't know why.

See : https://feedback.photoshop.com/conversations/lightroom-classic/lightroom-allow-multiple-versions-to-be-installed-contemporaneously/5fa871ae0796af4b5ad82da7?commentId=5fa88db103c8ec0f52010941

10.1.1 is out with no mention of this problem being addressed.

https://helpx.adobe.com/lightroom-classic/kb/fixed-issues.html

January 2021 release (version 10.1.1)

    Specific files missing Lens Metadata do not sync and cause sync to stop completely.

Hey, I'd like to know if it's possible to have LR CC 9.4 and LR CC 10.0 installed to the same computer, side by side ?
Thanks

This is just a hunch, but I believe there are two different issues at play here:

- Slow-downs of the LrC UI caused by the use of custom ICC profiles that are present independent of GPU-acceleration settings and which don't affect the stability of the host system. That's what I'm experiencing all the time since I've upgraded to v.10 and when using any other profile than sRGB.

- GPU-related artefacts, instability and lock-ups caused by LrC that affect the entire host system. I've had a couple of such lock-ups early on while running v.10.0 on Mojave, but they've since then disappeared completely for me (I'm not entirely certain whether the upgrade to Catalina or v.10.1 were responsible, but I believe it was the latter).

@7849046_weather: if you still have 10.1 installed, are the issues you describe still present when disabling GPU-acceleration?

I am using an EIZO CS2370 display, a custom color profile and macOS 10.14.6. Lightroom 10.1 makes macOS completely unresponsive as soon as I enter the development module. I cannot even shut the system down other than pressing the power button. Lightroom 10.0 works fine, though.

Adobe's silence is disturbing. It may mean that they are assessing the need to work on this issue based on the impact it has on customers combined with the work it takes to fix it (its cost effectiveness, if you have to call it by name). And if it turns out that it is limited to a few users (which would surprise me, however), the risk is that it will not be taken into account, betting on its disappearance over time as the material and the users' work context evolve. Let's hope that many of us will complain and consider changing software even if it's unpleasant (for me, it would be, but I have to keep working with updated tools).

So, Adobe, please do something for Lightroom lovers!

@Victoria_Bampton_Lightroom_Queen I just saw you answered my above question further up the thread. Thanks for that and sorry for repeating myself!

I just saw the update and am updating now. I was so excited... How disappointing. 

Could we just get a confirmation that Adobe is working on this huge bug? Or are we in reality too few that they can't be bothered?

Again how disappointing I thought here was the fix...

According to Victoria Bampton (the Lightroom Queen), the only change in this release is a fix for "an issue for specific files missing Lens Metadata […] causing the sync to Adobe cloud to stall".

Unfortunately, I'm afraid it will take much longer for our big problem to be solved…