Lightroom CC stuttering on iMac 27 inch Retina 5k Late 2015

These do seem to be issues that are somewhat unique to the 5k iMacs, however some

don't have issues. I guess no one has sat down and documented the issues as to whether

it is the i5 or i7 iMacs or one of the 3 video cards that could be in the iMacs. Or if it is

none of the above.

FWIW, my late 2013 27" i5 iMac does not have any major problems with Lightroom.

The only issue I have seen is a very inconsistent delay when transferring from Lightroom to Photoshop.

Sometimes it is a second or two, other times it is several seconds and does not seem to happen with

any apparent pattern.

My partner just bought IMac today from Pc world with 8gb of Ram and 27inch, he downloaded cccloud lightroom and photoshop. When i got home to test it bearing in mind also we have super fast fibre broadband with Bt.

I went to the Develop module to try a few edits, and there was a delay when using the slider and paint brush etc.

I then thought it may be the broadband but on my macbook pro retina it works fine with no delay, the iMac is less than 24 hours old, the whole point of buying it was just for editing.

We have done no installing of other software and only a couple of pictures in the Catalogue. Absolutely gutted, how can such an expensive machine run so slow with Adobe CC, or is this an issue with Adobe CC.

Any help or suggetions out there or advise.

Ps i have never posted on a Forum before so i think this post is linked to the post i was reading.

I haven't created a new post so hoping linking in a little late someone can help.

Hey see my post i am having the same problems, straight out of the box.

Did you find a solution, i am really gutted, lots of money for poor results in less than 24 hours.

Sunshinetina, I think I've read every post on every forum (Apple, Adobe, various photo forums) about this issues and they all follow the same pattern. People are trying to be helpful but clearly either nobody knows the cause, or if they do (hello Apple, Adobe?) nobody is telling us what it really is. It appears there are some 27" iMac retina users who say that LR works fine on their machines. But it appears there are lots who have top-end configured machines and LR has issues. Bottom line: no solutions, no word from Adobe or Apple about what causes the poor performance and therefore what sort of "fix" (software, OS, hardware?) would potentially solve it in the future. I REALLY think Adobe and Apple should be warning people about this before they fork over thousands of dollars/pound/euros for a high-end machine that can't fulfill the primary job for which it is being purchased. I think you have 14 days to return your iMac from the purchase date. I've heard the 21" retina works fine, but I don't have personal experience with it.

FWIW, the reason there are no definitive answers about Lightroom is because between various hardware configurations and third-party software, there are a nearly infinite number of combinations which no company can fully test which is one reason I believe Apple started a Public Beta program so there were more bodies to ferret out various problems.

Modern operating systems and software are very complex and it's a wonder to me they work together as well as they do.

FWIW, I was poking around in the Lightroom forums yesterday to find something

about an unrelated issue. From what I saw, there seems to be a lot of posts

about Lightroom's performance, not just on Macs but also on Windows machines.

Many seem to be on platforms that should never have any performance issues.

Maybe Adobe themselves can't even figure out what is causing it and it seems to

be the latest version as many say Lightroom 5 was just fine.

Just a reminder, Apple has a 14 day return policy on their Macs. I would suggest getting your new iMac from Apple directly or from an Apple store if one is close to you to make returning it easier. Myself, I want the iMac and will devote the 1st couple days or so to exercising it thoroughly and if it has a problem with LR and PS, back it goes.

mcrean, if you do go through with a purchase of the 27" iMac and test LR performance on it, I (and others, I'm sure) would be eager to hear your result. (BTW, I have not heard of problems with PS...but don't know if that includes Camera Raw, which is a lot like the Develop module in LR).

Did you ever resolve this issue?

I have a brand new iMac and Lightroom is slower than by 6 year old Macbook Air!!

Very frustrating