When publishing new post it takes 15-20 seconds how to fix this?

[samirb82]

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I am using BuddyBoss platform. On dedicated Linux Debian 11 server 64GB ram, Ryzen cpu 6 cores, m2 nvme 500GB. Plesk panel, nginx, redis, Litespeed cache plugin.

When I try to post content on feed it takes 12-20 seconds to publish simple posts.
I noticed in dropings this:BuddyBoss Performance API.
The website loads fast but the publishing feels slow and delayed.

Any suggestions?
Link to the website: https://bosnett.com

Kind regards.

Sam