P: Slow UI when using Mac and Custom Display Profile

It not hardware, more likely some software issue interacting with hardware. But maybe could be font related like the problems with PS 2021. Another thing to try is use a different monitor like I posted earlier where my old MP5.1 went from 10.1 being slow to it being fast and is now still fast with the old monitor attached again.

Yes, it's odd that my 'outdated hardware' including RAIDO storage SSDs, PCIe SSD primary drive, 48GB RAM and a fully Metal compatible, 10bit capable, Radeon RX Vega 56 8GB GPU blitzes through LR 9 but grinds to halt after an upgrade to LR 10. Hmmmm....

It's odd too, that so many systems 'better' than mine have to be downgraded to a canned profile to work at all. Nope, that argument doesn't work on me. There's a lot of processor hungry software out there (look at Gigapixel AI) and my poor old system gobbles its way through just fine - just not in LR 10. QED.

Belinda, we constantly ask for more performance and that requires the consumption of additional hardware resources. That is just a fact of life for computer hardware/software solutions. Yesterday's hardware is just not going to do a great job of running today's software. 

An unpleasant fact of life perhaps but nevertheless, a fact. 

LMAO. Bravo.

I've tried everything else, so I'll give it a go.....keep you posted 🙂

Anything is worth a try instead of doing nothing. 

In that case, perhaps standing on one foot while tapping the top of your head will work? No more useless than reinstalling the OS and a lot less work. 

Thanks bill330573.

I think we have to accept that for a significant number of serious Lightroom users, Lightroom was crippled after ver.9. That an application dedicated to photographers can't cope with a custom monitor profile might be funny if you had that kind of sense of humour and your livelihood didn't depend on it.

That a organisation as big as Adobe could create and release such a dog's dinner to paying customers is unconscionable.

Anything is worth a try instead of doing nothing. I no longer have the slowdown problem with 10.1 on two different computers. But if you would rather just complain instead of doing anything about it, so be it.

Belinda is right. You can find a literal flood of instances on this forum recommending reinstall of the OS, both MacOS and Windows, with no benefit. This is not the OS's of 10+ years ago, reinstalling is a waste of time and results in loss of all OS customizations. 

No don't do that. Bad advice. It won't work and will probably make things worse.

*novocastrienne Did you do a clean install of Big Sur? If not might be worth a try on a test partition. Also turn off all fonts once and see what happens.