Mark and @Pathal, we are asking DxO for faster previews and workflow and at the same time you are both pushing them for more accurate previews. The two directions are more or less incompatible. When working on sharpening or noise reduction, the only view which is relevant is 100%. What would help performance is if PhotoLab would first calculate just the onscreen pixels at 100% view rather than the full screen.
The reason performance is so poor right now is that most of the time PhotoLab is building a pixel perfect full image and then displaying just the part we need. For lower than 75% resolution apparently, there is already a preview proxy (without visible sharpening) mainly for colour. I’m delighted to hear that and will take advantage of it to do more of my work at Fit to Screen (hopefully PhotoLab will be a bit faster).
John Barrett, you wrote:
With a 5DS a local adjustment 30sec (couldn’t be kept as didn’t work so would have needed to be redone!)
Are you doing your local corrections with both Lens Sharpening and Prime Noise turned on? If so, I highly recommend turning then off and adding them only at the end. If you have to turn one on, make sure it’s just Lens Sharpening (I can see cases where one wants to see the sharpened image before making local adjustments).
You’re right, the lag between making an adjustment and seeing the result is really an issue. We need improved fast preview processing from PhotoLab (with a checkbox on/off). In the meantime, PhotoLab also needs us to follow a sensible workflow. If photographers turn on all the processor heavy controls early in our digital darkroom workflow, PhotoLab will be very slow.
Concur on the export with Prime Noise not being an issue. Final exports with really high quality noise reduction take all the time they take. Final exports cannot be accelerated with GPU or preview proxy versions. Here’s a discussion of some of the quality issues with GPU acceleration. It’s not what you want to be using to create master files.
HQ Fast is there for event photographers who have to get pictures out quickly. Even HQ Fast export must be full CPU pixel perfect processing. There’s few photographers who want to export glitchy masters, even if it saves time.