Most Powerful Computer Available - STILL SLOW! Local Adjustment Brush!

Same problem for me, i have the new lightroom 3.2, when i use brush all became slow. I think is a software problem. I have a good notebook (i7, 16 GB RAM, gtx 1650) 

Are you having problems with your i9 or with the new Ryzen PC?

AMD Ryzen 9 3900X 12-Core 3.8 GHz
64 GB RAM
11 GB Video RAM: ASUS ROG STRIX GEFORCE RTX 2080 TI OC 
2TB SSD

This looks like a Lightroom Workstation from Puget Systems? It's probably one of the best performing Lightroom PC and should blow away the i9.  My suggestion is you download the PugetBench Benchmarking tool from here:

https://www.pugetsystems.com/labs/articles/PugetBench-for-Lightroom-Classic-1571/

Run it on your system and see how it compares with the published scores from Puget. This will tell you if there is something on your PC configuration that's slowing down the performance, as the benchmark tests Active functions like Local Brushes.

"Because of the 150 MP files, I'm often at 1:1 and closer, but that is where the main issue really is happening."

I'll ask again–What type of local eidits are you actually applying that requires 1:1 Zoom view? Regardless, I'm not seeing significant lag using the Adjustment brush at 1:1 Zoom view with LR Preferences> Performance> 'Use Graphics Processor set to 1) OFF or 2) set to ON with Zoom at 1:2 or lower. What do you see for # 1 and #2 as described? Perhaps export one of the files to DNG file format with your local settings applied and upload to a file share site so we can try it on our systems.

There's also a Windows 10 'Ultimate Performance' plan setting, which you can try as outlined at the below link. I tried it with the IQ4 raw file and saw no improvement. YMMV....  Also try changing the settings in the Nvidia control panel to 'Prefer maximum performance' as show below.

https://www.howtogeek.com/368781/how-to-enable-ultimate-performance-power-plan-in-windows-10/

Reduce the resolution from 4K down to 2K

Issue is all those pixals being recreated with each and every edit you implement. And with the adjustment brushes, compounded edits.

If you want your system to run faster, in all respects, disable all power management, Run It At FULL, Max, performance. There are hidden setting that Slow all computers down to try and save power.

Also disable all AV software. Expecially the MS Windows defender or whatever it is called.

I was noticing a full system slowness and there was a process that I hadn't seen before. It was the Real Time scanner for Win defender. it was constantly scanning the LR catalog file. Disabled that and performance came back.

Actually I was kind of surprised with the speed of editing a 150 Mp raw file in LR compared to the ~22 Mp raw files I normally work on. That's a size difference of almost 7X so I would have expected a very noticeable difference, which I'm not seeing. As long as Zoom is set to 1:2 or lower it's very responsive on my lower performance system.

Thanks for testing this Todd.  It must be because Lightroom is doing a lot more in the background.

Some possible examples:  (Wild guesses)

1. Lightroom is writing every edit to the database and ACR is just writing to an XMP file

2. Lightroom has to update all the filters, smart collections etc

3. Lightrooms Lua code is just plain bad.  

I noticed the speed difference in most of the versions up to about Lr7 and then I quit comparing.  

"I haven't tried this in a few years but ACR used to be more responsive than LR. I am not interested in testing this as LR is working good for me but the OP might want to try this on their 150MP files."

I can confirm the local controls in ACR 12.2 are much more responsive than in LR 9.2. The only exception might be the Spot Removal Heal function. This is with GPU Preferences set both ON and OFF in each application. Kind of a surprise–Thanks Bob!

DJ

I haven't tried this in a few years but ACR used to be more responsive than LR.  I am not interested in testing this as LR is working good for me but the OP might want to try this on their 150MP files.  

The OP also indicated that using the ACR filter in Photoshop was a faster workable solution except for applying edits to multiple photos at the same time.  Using the Bridge/ACR method takes care of the multiple photo edit issue.