Slow sharing

Hi , i use the form ‘Contact List (Roster) Sharing’ to share a group with other users.

When I click on the button ‘Save contacts list setting’ it takes a lot of time (several minutes).

Maybe there is another way to do this? I saw that he writes to a table named ‘ofGroupProp’

I have the same problem with Openfire 4.2.3 (64 bit version). Because of this, I have to stay on version 3.9.3, in which this problem is absent. How to fix the problem?
My o.s. is Windows Server 2012 R2 x64.