The folIowing solution relates to our experiences with the latest ID CC 2015 (ver 11.1.0.122), though it seems PS and/or AI are also affected by the same problem.
First, I believe it's the Apple 10.10.5 update that broke things, not the Adobe update, for us at least. I say this because some of our Macs don't yet have the Apple update installed, but do have the .122 Adobe CC update, and they work fine. Our other Macs however, with both updates, were clobbered. All the Macs are identical hardware (iMacs, same versions and configs) and are on the same network, so we can rule out any issues there.
If, like us, you're finding the fixes already around the web just don't work (or at best don't stick for long) then try this simple fix...
- If any CC apps are open or have been running at all since your last Startup, do a Restart now. A clean slate to begin!
- Disconnect from the internet. Any method will do... either unplug the network cable or, in Sys Prefs/Network, turn off Ethernet or Wi-Fi, or uncheck any proxy server settings, whichever of these is appropriate for you. If you're unsure whether you've definitely disconnected, try accessing any web page in your browser as a test.
- Launch the CC app. (Best to launch all of the big 3 CC apps (ID, AI, PS) at this point, if you use them all).
- Re-connect to the internet (you can now continue to use it).
Now try using ID (or PS or AI) again. Faster? This fix should keep working until you next quit the app(s). So, just leave the app running.
If the above makes a noticeable difference for you, I'll later show you how you can automate things to produce the same effect, to avoid the repeated hassle of applying the fix.
Explanation: The CC apps each try to establish an internet connection (to Adobe presumably) in the background at launch time only. By preventing this initial connection as per above, the lag issues disappeared. The apps appear to function without any unwanted side effects. Only a short temporary disconnection from the internet is needed, during the app's launch, so no great disruption to normal working. Connections to e.g. networked file servers, printers etc don't need to be interrupted at all, only the internet access for the short time.
I'm not sure whether the above fix would also prevent synching to the CC Cloud etc, since we aren't using that. However, Adobe CC Desktop still re-establishes its internet connection, and Adobe sign-ins are unaffected, so I guess synching may not be a problem after all (?). Anyway, no harm in trying, if you need it.
Good luck! :-)
Paul.