Lightroom 4 NR Slowdown

I notice an issue with LR4 on W7 -64 that wasn't there with LR3.

Things are fast, but when you turn on any Luminance NR, slider controls are very slow to respond. You can change say the WB, and it takes about 3-4 seconds for the window to update. With no NR turned on, changes are instant.

I should add this is only a problem when using Raw images with the new 2012 colour process of LR4. Even exporting takes about 2-3 times longer to process the Raw image.

If it's any help I'm not seeing this issue. I am on an iMac i7 with 12 gig of memory and processing Canon 7D raw images. Seems at least as fast as LR3.6.

I seem to always end up in dark areas using high iso and still being dark so I'm using NR in LR4. And it works wonders.

I'm seeing the issue with all the sliders

I'm not home now to experiment, but I may not have been aware of the problem because I have my defaults set to 5 units of Luminance NR for all ISOs (because Sharpening is at 50% Detail). I will try putting it to 0 to see what effect that has, although I haven't really had a problem of slider lag.

One solution, if you do have a problem, would be to leave NR to the end of your workflow. Same might be true of Lens Correction which like NR is resource intensive.

I've found that the slider lagginess is greatly reduced or eliminated by turning off the filmstrip at the bottom of the screen. Just click the little arrow to open or close it as needed, then edit with it closed. I haven't tested it specifically with NR applied.

I have filmstrip mode turned off already, but I did some googling and this seems to be an issue at Adobe Forums. Even people with newer computers and 8-12GB of memory notice the lag. APPARENTLY Adobe is supposed to be working to fix this with an update, the 4.1 RC some say helps somewhat already. It's definitely related to the new LR4 2012 Process more than the NR it seems (since NR doesn't slow things down using the old 2010 Process from LR3).

LR4 is significantly slower than 3.6.
One thing that helped somewhat was to raise the priority of the lightroom.exe process.
The slowness is quite strange to me because CPU usage is under 20%, ditto for memory usage, and HD throughput is also really low. No resources seem to be maxed out.

For me I do notice LR4 CPU usage does go up quite a bit when using the 2012 process, nearly 100% on a a dual CPU and about 1GB of memory gets eaten up vs maybe a few hundred with LR3 (I think).

I've notice a big speed difference between 3 and 4.
In 4 when in develop mode, every 5-10seconds I get the spinning wheel when trying to make changes. First noticed it when trying to do spot removal, and every 1 or 2 spots it will load and ill have to wait.
Really becoming a pain.
Im on a 2011 MBA I7 13". didnt have any issues with LR3.

Did you report it on the Adobe site?

I must be one of the lucky ones. Running 4.1RC I have no problems with speed. All the sliders react quickly and that is with the filmstrip open, +5 on Luminance NR and Lens Correction enabled. With those things closed changes are instantaneous. The only place where I have to wait is with the Spot/Healing tool, where it takes two seconds for the second circle to open and the clone to be applied. If I drag the circle to a new location, it's about seven seconds to do the new clone. As I close the functions mentioned above it gets progressively faster until a new spot is immediate and a dragged spot takes about three seconds to redraw. I have Windows 7 64 bit with 8 GB memory and an additional 4 GB of Ready Boost memory, but with LR4 running alone RAM usage never gets up to much more than 3GB (system + LR). CPU (i7) usage might go up to 50% for a couple seconds, but the only time I have ever seen it go to 100% is while writing jpgs.

Interesting. I notice export is much slower too with LR4 using the new 2012 process, anybody else?

I did some NR and other edits today on some natural light portraits taken at 3200 ISO. With the filmstrip open, the sliders were laggy as all get out, but as soon as I closed the filmstrip, they were completely responsive. On this laptop the difference is night and day. It's a Sony Vaio i7 Quad on Win 7 with 6gb ram and 1gb nVidia graphics, with a second monitor connected via HDMI.