P: Noise reduction effect not displayed in Develop mode

I dont think they decided to drop it because it works without GPU acceleration so clearly the feature is still there, just doesn't work any more.  Also nothing in the changelog or notes about it so im going for bug.
Im gathering eartho doesnt use the features which is fair enough, everyone has a different workflow.  However for me the approximation is "near enough" to get me started and culling and serves as a quick way to make adjustments before going in to 1:1.  Its a big part of my overall workflow (and id argue you cant see how an image looks overall scrolling across it in 1:1 looking at snapshots in a zoomed window)
Quite simply, the feature worked perfectly on the previous version and still works now without GPU acceleration.  Unfortunately, turning GPU acceleration off makes the already fairly poor performance even worse so its not a satisfactory work around.

As a side question, is anyone experiencing this bug with an accelerated GPU that ISNT nvidia? (AMD etc)? 

Spoke to the tech support guy today. They said my GPU doesnt support LRCCC. I think its ludicrous that a GTX Titan doesnt support LRCCC. Weighing up option elsewhere, Capture ONE, DXO and ON1. Hopefully Adobe will have a solution or a better answer by the end of the year. At this point Rawtherapee is better than LRCCC. It doesnt support GPUs....but its free and I know what I'm getting.

Along with other problems in the new LR Classic, my images are grainy in Develop but not in Library or during export. The develop module overall has been extremely slow to respond to sliders. 

I run MacOS El Capitan with 32GB RAM. 

Anyone know how to fix this issue? Thank you in advance!

After I upgraded from Lightroom CC to Lightroom Classic CC all my images look grainy. Even when shot at ISO 100. It is really disturbing and I'm not sure what to do. I never had that issue with older LR versions. I updated older catalogs and the issue is the same with those photos. Images that looked great are all grainy now. 

Also, LR Classic crashes at least 4-5 times while editing a wedding. So annoying. Anyone having similar issues? Or know how to correct them? 

Same problems here on macOS High Sierra and LR Classic (macbook pro and iMac). A lot of images show high color noise in Develop module. When switching to Library module the are OK. The whole detail panel (sharpness and noise reduction) doesn't work then.

I tried to find our what's the reason (and please don't tell me I have to view on a certain percentage to not have the color noise). Some images I have set high WB values. When I reduce WB noise goes away and noise sliders work as usual. The break point was 20.401. Might be just by accident. But then I also have images where WB doesn't play a role with color noise. When I reset the tone controls noise also goes away.

Other than this buggy behavior I don't see any improvement of the new develop process (OK, the numbering). I'm a bit angry as I now spent several hours of beta testing instead of being productive. Any quality control for LR classic at Adobe?

Except you can see NR in fit and fill modes, you've been able to see the estimate of it for the last few years in lightroom and you can still see it if you turn off GPU acceleration in the menu.  Its a bug.

I disagree. Light, shadows, whites and blacks directly show dynamic range, and if it can not be approximated correctly at "fit", there would be obvious banding across all images. Everything at "fit" is an approximation and maybe adobe decided to drop NR approximation for what ever reason in the new version.

I have never had performance issue with noise reduction. If anything, the performance issues were more prominent in filters, masks and spot removal.

Also on the "!" it says "for more accurate....." which means there is an less accurate, but still visible NR at "fit"....which it doesnt have anymore.

Noise reduction and sharpening are completely different than those other adjustments. That little ! in the details panel has been there since v1 or 2 so that people would understand why their images don't look right at Fit view.

Everyone's been complaining about speed for years now and the main contributor to sluggishness in Develop has always been the NR. I imagine to speed things up they've modified the render so that it's not wasting cycles to display an incorrect view. 

Again, there's no point in looking at NR when zoomed to fit. You HAVE to be viewing at 1:1 or looking at the Detail panel preview.

I see your point but you are missing a key point everyone is saying - before LRCCC this was not an issue.

I certainly didnt have this issue LR6. This is a post LRCCC issue visible to some users.

Also, your arguments is true to all settings...not just NR. Highlights, shadows, blacks whites, tone curves etc.....they are all done at 1px wide and everything is an approximation at "fit" view because, technically lightroom can not show true highlights, shadows, blacks, whites, tone curves etc at "fit". 

 

@4271024, I am understood Your explanation, but I see a big difference between old LR6 (CC) and new LR Classic. By the way, I clearly see noise reduction effect on my Mac book retina display even at 25%.