FreePBX 15 is slow when opening an extension or a queue

I am mighrating from bare Asterisk to FreePBX 15 (Asterisk 16.6.2 and the UI firmware 12.7.6-2002-2.sng7). I successfully imported about 1400 extensions and added ~180 queues with static agents and noticed that opening a queue/extension settings takes long time - about 15-20 seconds.
Checking the Asterisk CLI, I found that the Web UI is pushing several thousands manager commands to retrieve all the extensions, queues and other user settings from Asterisk DB, causing the web UI stuck and wait for the database poll to be done.
Does anybody know how to disable that? I am thinking about rolling back to 14th version which has the same number of users but is working fine.

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