P: Quick Develop VERY slow on my system (6 sec vs 1 sec in LR 5.7)

Hi David,

In my testing, the standard preview size in the catalog settings definitely makes a difference to me in terms of the QD rendering performance. In Lr 6, the default standard preview size is Auto, which is the largest screen size (long edge) for your attached monitor(s). That would make a difference between 6.0 and 5.7. In 5.7, you can set to one of a few predefined standard sizes only. In Lr 6, if I set the standard preview size to 2048 on my MBP retina display, the QD change is almost instant.

Simon,
Thanks for your help so far. And thank your team for working on improving Lightroom. You've made great progress since v1.
At this point, I'm going to drop out, as I don't get paid by Adobe to troubleshoot and develop your software.
I'll try it again at v6.1 or 6.2 or whenever it is ready for release.
Dave

In both cases (1680x1050 and 1200x800) the rendered display image is miniscule, as I am only viewing a "Fit" preview image which is about 800x530 (.5MP) or 600x400. And why should CC be having such trouble when 5.7 is just fine?
I am talking about "Fit" with both side panels showing.
When I turn off the left side panel, so that the "Fit" preview image is now slightly larger (700x460), 5.7 is unphased, but CC starts to slow down already.

At 1680x1050 retina, Lr would need to render about 6.9MP image per setting change, depending on the actual image size, it might just crossed the pyramid threshold to need to process the full resolution raw file. You can try to experiment with the zoom level (1:4 or 1:2) or window sizing to see which one works best for you.

OK. Now we're getting somewhere.
Is NOBODY else seeing this problem?

5.7 Is significantly outperforming CC in almost every situation.
No other activity. No Mobile sync. Face detection is turned off.

With my MBP retina display set to 1680x1050 (Intel Iris GPU), CC is extremely slow (6-8 sec) on even small (24MP) NEFs and DNGs. But it is reasonably responsive (1sec) on 24MP JPGs.

Same files in 5.7 at same resolution are less than 1 second.
So LR 5.7 works just fine in all situations, but LR CC is having real problems in some of the identical situations where 5.7 is working fine.

With my MBP retina display set to "Best for Retina" (about 1200x800), CC is much better at about 2 seconds on 24MP and 36MP NEFs and DNGs, and instant on a 600x600 JPG.

At "Best for Retina" (about 1200x800) display resolution, 5.7 is the same speed as CC.

You can click the Identity Plate area on upper left and show the activity center to see if there are any current long running background tasks.

GPU should not matter in the Quick Develop case. The screen and preview sizes matters. Do you have other tasks running in the background, like Lr mobile sync, face detection/indexing?

Try disabling the GPU drawing in Lightroom, restarting and see if the speed has improved. (just to see if the cause might be the GPU driver or code)

720p and 1080p. Changing monitor size has no effect.
Tried all 4 sizes (minimal, standard, smart, 1:1) of preview and no previews. No effect.

No matter what I do in CC, "Quick Develop" is VERY slow (4-8 sec to render).
No matter what I do in 5.7, "Quick Develop" is reasonable speed (<1 sec to render).

What resolution monitor? And what size do you have set for previews in Catalog Settings?