Recommendation to improve wp-admin panel performance

Here is step by step guide to identify performance issues.

1. If server isn't in production or if it doesn't matter very much, try to switch to any default WordPress theme (TwentySeventeen for example) and look if anything changes.

2. You can deactivate all plugins and look if it helps. If yes - try to turn on plugins one by one and this will help you to identify which plugin causes the performance issues.

3. Try to install a free plugin called Debug Bar (you can do it from Plugins-Add New), it will show you slow things on your website

   

4. Inspecting your browser console also might help.

Since this issue is caused by the interaction of both your code (plugins) and your production environment, you need some tool that takes all of that into account when attempting to measure the cause.

I really like New Relic for this. It is a paid product, but with the free trial you might be able to diagnose your issue. They have a WordPress integration that will show you specifically how many seconds/ms each action hook and plugin is taking.

There are several php performance tools such as XHProf which can help you determine the cause of the problem.

Please don't forget to tell us what the problem was, by updating your answer!