I am seeing nothing like this on my Windows 10 1511 system with LR 2015.6.
Try switching over to the Performance tab, then click on Resource Monitor at the bottom, go to its Overview tab, put a checkmark next to lightroom.exe in the process list to filter activity by just the LR process, then watch to see what files or network access is occurring.
On my system, where I'm not seeing memory grow with LR idle, and after just terminating LR, this is the file access and network access I'm seeing, where most of the files aren't opened until I terminated. Keep in mind that the Resource Monitor uses a moving average so any activity in the last 60 seconds will contribute to the numbers and it takes a minute for things to drop off after some activity so that's why I can see files that were opened even though LR has terminated:
Both of our runs show a continuous network connection with a low level of bytes/second that never goes away.
Using ping -a 22.214.171.124 from a command prompt, mine shows an IP4 address that resolves to somewhere at Amazon: ec2-52-27-83-140.us-west-2.compute.amazonaws.com [126.96.36.199] but the pings all fail which doesn't necessarily mean anything is wrong.
Yours looks like it shows the actual hostname ec2-something is listed in Resource Monitor.
Presumably you have all three of these paused:
If you use the built in system reporting within Lightroom, (from the menu bar, Help>System Info) you can also the memory leak in action.
I took this screen shot after starting Lightroom.
20 minutes later, without using even touching Lightroom, the memory allocation had gone up by 266MB, equating roughly to 13Mb/Minute.
I then minimised Lightroom, (you can do this without having to close/minimise the System Info window) and Lightroom memory allocation reduced.
On the surface at least, this looks to support the memory leakage argument.
The continuous network connection is suspicious, as is the difference for how things act on your computer vs mine since our systems are similar except yours has more memory.
If you create a brand-new catalog, restart LR pointing to that empty catalog, does it happen? If not then it could be catalog dependent. It could also be plug-in dependent. Do you have any third-party plug-ins installed?
Here are mine, where I have a few that don't ship with LR:
After talking to support and jumping through hoop after hoop, I did a clean boot (https://support.microsoft.com/en-in/kb/929135)and the issue still occurred. I then had to do a clean install:
Uninstall all of CC (for me it was Photoshop and lightroom and CC) via the OS uninstaller.
Then delete the following folders (if they exist) for clean install:
%temp% (delete contents)
C:\Program Files\Common Files\Adobe*
C:\Program Files\Common Files\Macrovision Shared
C:\Program Files (x86)\Adobe*
C:\Program Files (x86)\Common Files\Adobe*
C:\Program Files (x86)\Common Files\Macrovision Shared
C:\Users\<user_name>\AppData\Local\VirtualStore\Program Files\Common Files\Adobe*
~ Registry Keys to be deleted (if they exist)~
Then reinstall all of it.
It seems ok now, with some spikes when idle but it does seem to drop back down. Idle and minimized sits at < 200Mbs (instead of steadily climbing to 7GB and staying there). I'll monitor, but this may have resolved the issue.
A couple folders in your description to delete say "Macrovision Shared." I'm on a PC, and my folder says "Microsoft Shared" at the same location. Is that the same thing? I dont have a Macrovision shared, but Microsoft shared. Just making sure before I delete it.
do not delete unless it is an exact match. some folders and or registry keys wont exist on all installations/machines.
If the folder doesn't exist - you're already ahead of the game: one less thing to do.
Thanks for the help Griffinshot! Your procedure made LR useable for me again!
It's not 100%, but noticeably better. Dropped the memory usage down from 9-12GB-ish to about 2.5-3.5GB-ish.
The memory usage still seems to steadily climb a bit while sitting unused (no plugins running), but before uninstalling and doing the clean install as described, on LR 2015.6, editing was very frustrating with constant lags and frequent '(not responding)'... it still does, but much less so.
I have a sufficiently capable system (i7 4790k, 16gb, SSD, the graphics card is off), but I have noticed over the last year or so of updates, LR has been getting more and more challenging for me to use... and even though I like some of the new features, I have begun exploring my options, this frequent struggling with CC has been taking the fun out of my digital darkroom.