P: Slow UI when using Mac and Custom Display Profile

After upgrading to Big Sur my Lightroom Classic 10.1 is essentially useless. Created a new catalogue... opens fine... imports fine.... click on the develop tab and the trouble starts. Essentially freezing and becoming useless. It seems this particular issue has been an issue for months with no effective solution which is incredibly disheartening. 

macOS Big Sur Version 11.1

Mac17,1

Processor Name: Quad-Core Intel Core i5

Processor Speed: 3.2 GHz Number of Processors: 1 Total Number of Cores: 4

L2 Cache (per Core): 256 KB L3 Cache: 6 MB

Memory: 32 GB System Firmware Version: 429.60.3.0.0

SMC Version (system): 2.33f12

AMD Radeon R9 M380 2 GB

I will now try and uninstall Lightroom 10.1 and go back to 10.0. I doubt it will work but I'll try.

FWIW, if I switch to sRGB calibration (from Eizo Color Navigator) and vanilla sRGB Profile, Lr 10.1 goes like s**t off a shovel.  Otherwise it just goes like s**t.

But I didn't invest in a Mac Pro, twin Eizo monitors and, indeed, an Adobe subscription to do photo editing in sRGB.

I own licenses to several comparable applications to Lr, developed by teams with far, far less resources, and non of them of them have any issue with using a "professional" ICC profile. 

So I'll add my voice to the chorus of "when exactly, are your chums going to fix this, Rikk?".  If they're not, I'm sure I can safely assume you're arranging a refund ? After all, if it is such a small number of subscribers (not "users", "subscribers") then cancelling subscription fees until this disaster gets fixed is hardly going to impact Adobe's beloved bottom line, is it?

@Rikk With respect, this is two months old, and the issue is still not resolved. LR 10 is simply not ready for professional work. Adobe should not have released it.

I am running a fully specced 2013 MacPro (12-core CPU, 64GB RAM, 2 x AMD FirePro D700 GPUs) and LR 10 froze my machine so completely that I could not even force-quit. The only thing I could do is a hard reset. I've never had any program render my Mac unusable before. That's really not acceptable.

 I solved that problem by turning off GPU acceleration.

This may be old information. Check your GPU History.

No difference in speed noted when running 4K... strange, although LRC marks the GPU as “acknowledged”

@bill_3305731 Not true.

Adobe Lightroom Classic GPU FAQ

How does Lightroom Classic use the graphics processor?

When configured (Preferences > Performance), Lightroom Classic can use a compatible graphics processor (also called a graphics card, video card, or GPU) to speed up tasks of displaying and adjusting images in the Develop module, the Library module's Grid view, Loupe view, and Filmstrip. Enhance Details is also accelerated by the GPU. Using a compatible GPU can provide significant speed improvements on high-resolution displays, such as 4K and 5K monitors.

The Library module does not use the GPU. 

@eschhols

I have recently switched to a 5K retina display so that may have contributed to a slowdown. But again, having much worse browsing performances in the Library module than in the Develop module does not look right...

Solved: reduce screen resolution to I.e. 2560x... and it all is back to super fast. For quick editing in grid view, that’s okay. 
best 

Sven