I have a news portal Using WP cms, It has around 90K posts. DB size 2GB. Used Apache, ngnix,

WP Memory Limit 4096M, Time 300 Sec, Using CDN :)

I am using 2 Dedicated servers E5 2650 V4, 96GB Ram. and 2650V4 32GB for Database.

My site is doing fine, Dashboard and site both are faster, but the problem is when I try to add/Edit/Update/publish Post It has taken a long time, like 40 Second to 1.20 Minute.

I have optimized DB lot of times, Changed to the default theme, check all plugin, There is no conflict. If I use default theme 2017 and deactivate all plugin, same problem.

Can anyone give me better suggestion?