My guess is ID is trying to sync a library...
... well what type of library? All elements linked to this document are local...
Thank you for you help
The CC Library. You don't have to be actually using it for ID to try to communicate with it. I believe it can be turned off in the prefs.
You might find this thread helpful: Indesign CC June 2015 update is seriously slow - HELP!
I Try this quickly then...
Let you know asap.
Can you advise how to TURN OFF that pref you mentioned?
Couldn't find it so far...
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Can't find anything in the prefs.
I found this method to disable the libraries in post 155 of the link I gave you above: Re: Indesign CC June 2015 update is seriously slow - HELP! The path info is for Mac, but ti shoudl work on Win 10 if you locate the folders. I'd rename them rather than deleting, so you can name them back for functionality if you choose to later. They may also regenerate on their own after a restart of the program. There is also this: Solution to the issue: Adobe Creative Cloud Libraries panel doesn't load in desktop products
You should also try setting the number of recent files to display at 0 and see if that makes any difference, and uncheck any box in a dialog, like Swatches, that tries to add something to the CC Library.
I have not experienced any slowdown her on Win 7, for what that is worth, and I don't use any of the cloud-based extensions like sync settings or Typekit fonts. I seem to be at 11.1 after a system restore to fix an email issue, even though I updated ID last week through the cloud and thought I was getting 11.3. I would hesitate at the moment to update to 11.4 as there seem to be a number of new bugs.
I've tried the 3 actions you mentioned to fix this issue :
1 - Rename Pref in Application Data and set the old one (10.0) as new one (renamed 11.0)
2 - Set number of recent file to display to : 0
3 - Kill CC Library through computer Task Manager
A slight improvement, thank you for that, ... but definitely not a FIX.
Only solution 3 gave speed improvement.
What shall I do now?
I think I would uninstall and reinstall InDesign.