Windows 2016 File server slow to open and save file in share depending on user group.

Need file sharing performance issue fixed.
1. Windows 2016 File server slow to open and save file in share depending on user group.
2. Windows 2016 File server and client task mgr show 17 mb of file transfer when DOmain user member opens file "A". Domain admin member opens file "A" 1mb of traffic. on same pc anywhere in the building on any pc. (so I do not think this is a network card issue) Log in as Domain admin and file opens on client pc instantly. Login as Domain User and file open takes forever. Forever defined: 19Kb pdf file over 1-gig network connection takes 15 seconds to open file.
3. Variable to consider: The files in question reside in a folder with 56k in pdf files total. About 4 gigs of files. When same scenario above is applied to folder with say 1oo files you cant really tell the slow down or lag. It seems to manifest more when you have a folder with a huge number of files in it.
4. Variable to consider: As a test, logged into client pc as domain user, I can recreate the share and use domain admin credentials and file opens instantly.
5. This really seems permission based.
Claude HaydenIT AdminAsked:
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David Johnson, CD, MVPOwnerCommented:
4000 files take a long time enumerate. for every file the file has to check permissions and then enumerate the groups and then once the group has identified the user is a member of a group then ok the file to be enumerated for the user.  A millisecond here a millisecond there tends to add up to real time after a while
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Marc Lester Martin, E.C.E.IT SpecialistCommented:
Check the permission of the folder. Usually you create an AD resource group then apply to the folder. Next you populate the AD resource group with AD role groups (member of) then you put the user. The Administrators has access directly on the file server while the users are in one of the AD role groups. Try to provide an access to a non-admin user directly in the folder. If it speeds up, then your domain controller is not working properly.
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Claude HaydenIT AdminAuthor Commented:
I think I have a fix for this issue.
Thanks to this guy Zubair Alexander https://www.zubairalexander.com/blog/how-to-fix-slow-access-to-network-shares/ 
In Windows Search box type regedit and press Enter to access the Registry Editor.

  • Go to HKEY_LOCAL_MACHINE and locate System\CurrentControlSet\Services\Lanmanworkstation\Parameters.
  • Create a new DWORD value for DirectoryCacheLifetime.
  • Double-click the value and set it to zero (0).
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Claude HaydenIT AdminAuthor Commented:
Thank you for the input from others.
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