How to handle 5 million Posts in wordpress?

Spontaneously, I can think of a server-side object cache. E.g. with the plugin https://www.ads-software.com/plugins/apcu-manager/ which, however, requires the PHP module apcu in your hosting.

Then there is also the question of how many data records you display per page? Leave it at 10-20 if there are currently more.

Are you already using any plugins? Many also interfere here and could delay the loading time. Deactivate all plugins as a test and see how it looks.

Hello threadi,

Thank you you for your reply. can we speed up response without using cache and we are displaying 10 records per page.

Without caching, the performance of your hosting is very important. Take a look at this article: https://developer.www.ads-software.com/advanced-administration/performance/optimization/