Have done some more testing:
- S-Curve adjustments show immediate changes with GPU acceleration off.
- Adjusting the S-Curve is slow and jerky with or without acceleration.
Went back to 5.7. Runs immensely better on my 1.5 year old machine.
YMMV. But LR6/2015 doesn't seem to be optimized well yet. I'll check it again maybe in a couple of months to see if anything has changed.
Likewise: GPU recognised, but LR-CC is faster if I switch GPU off!
How can Adobe get away with this?
importing new photos is just a nightmare! I dont know what is going on... Lightroom is eating away 40% CPU and nothing is actually happening...
Turned off GPU to see if any faster... nothing
Lightroom version: CC 2015 
License: Creative Cloud
Operating system: Windows 8.1 Business Edition
Version: 6.3 
Application architecture: x64
System architecture: x64
Logical processor count: 4
Processor speed: 3.2 GHz
Built-in memory: 24543.8 MB
Real memory available to Lightroom: 24543.8 MB
Real memory used by Lightroom: 971.6 MB (3.9%)
Virtual memory used by Lightroom: 1005.1 MB
Memory cache size: 423.6 MB
Maximum thread count used by Camera Raw: 4
Camera Raw SIMD optimization: SSE2,AVX
System DPI setting: 96 DPI
Desktop composition enabled: Yes
Displays: 1) 1920x1080, 2) 1920x1200
Input types: Multitouch: No, Integrated touch: No, Integrated pen: No, External touch: No, External pen: No, Keyboard: No
Graphics Processor Info:
GeForce GTX 460/PCIe/SSE2
Check OpenGL support: Passed
Vendor: NVIDIA Corporation
Version: 3.3.0 NVIDIA 344.48
Renderer: GeForce GTX 460/PCIe/SSE2
LanguageVersion: 3.30 NVIDIA via Cg compiler
Not all GPUs are created equal. If Lr 6 runs well for you while GPU is turned off, but not while GPU is turned on. It typically a good indication that your GPU, while meets the baseline system requirement, is not good enough for your particular setup. It could the hardware or the driver or I/O throughput etc or even the size of your display etc.
problem solved for me...
temporary clitch with a drive and sata connector I believe. reboot and checking cable helped for me for the import
still need to work with LR6 more to see how much faster it is...
I'm already sold anyways as now I can have a touch interface when using my surface pro 3
To be honest it ran terribly with it on and it ran terribly with it off. At least 5.7 is consistent with is performance despite its mild hangups.
But thanks for the non-answer. I'll come back to LR6 in a few months to see if anything has improved.
Yes - I'm noticing LR6 is slower for some things as well, in particular the Adjustment Brush and the Spot Removal tool. When GPU is turned ON they are immensely jittery when I click and drag the region I'm applying them to, however when GPU is turned OFF they run much smoother. I can't imagine this is an issue of my graphics card "not good enough for my particular setup" as the previous post assumes, I have a top of the line iMac Late 2013:
iMac (27-inch Late 2013)
3.5 GHz Intel Core i7
16 GB 1600 MHz DDR3
NVIDIA GeForce GTX 780M 4096M
The radial filter and graduated filter are definitely improved though. It's like Adobe focused just on these 2 small tools and made the rest of the program the exact same or WORSE with their so-called GPU integration. Not happy!
Haha yeah I noticed the graduated filter ran fine.
As far as spot removal, I kind of gave up with that in Lightroom a while ago. If I have one or two to remove, I'll do it. But if I have to get any more extensive with it I switch over to Photoshop. Dozens of little non-destructive edits add up and slow things down, unfortunately.
Agree. Adjustment brush is super jerky and sluggish with GPU on and off. Spot removal tool is VERY slow. What gives?
LR6 will probably need some optimization updates down the line. I opted to stick with 5.7 and it is night and day difference how much better it runs on my machine. I think this is a YMMV situation though.
LR6 is much slower, I process hundreds of photos a day and going back to LR 5.7
My PC X99, 6 cores at 4.5GH, 32GB RAM, Radeon R9 2GB RAM
Don´t blame hardware when it works very well with PS CC2014
Exactly, Photoshop runs just fine with my machine and my GPU is most definitely not holding back my machine when I use it.
yep, on neither my work's desktop nor my personal laptop does LR6 run any faster, in fact, the gradient, cloning, and brush tools are much slower and laggy...may have to downgrade as it's beyond frustrating.
Anyone in this thread update to 6.1 yet? Are these issues fixed?? :/
I am on 2015.1 and the issues are NOT fixed. Any use of the Surface Pro 3 Pen with a tool (heal, spot, crop, level) on my i5/256 is unusable. Trying to crop or level a photo with the pen creates 5-10 incorrect entries in history as it jitters and lags. Cropping will also randomly switch between rotate and crop. Very frustrating.
This is with GPU Assist on or off.
Note I did NOT have these issues with 5.7.
iI'll add on here..,,just downloaded to lr2015 and I hate it. Way too slow for editing raw files. Will explore how to revert.
I have had to revert to 5.7. Is it just bad luck that we have purchased some software that doesn't work on our computers and now we just have to wait and hope that Adobe may do an upgrade that will make their software usable?