This article aims to help you troubleshoot slowness in your WordPress admin area. In order to achieve that, we first need to find the root cause of the issue. It could be a couple of things, so please review all of the steps carefully.
Check your Resource Usage section
Follow How to check resources usage article to find out if you're hitting resource limits for your plan. If that's the case - it is likely the reason why your WordPress admin area is slow. In order to troubleshoot this, you will need to optimize your site. You can check the following articles for steps on WordPress optimization: How to fix an overloaded WordPress website and How to Speed up a WordPress Site.
Optimize your database queries
Unoptimized databases which contain resource-heavy queries are also commonly culprits in causing slowness in your WordPress admin dashboard. It's important to keep it optimal to enhance the performance of both, your website and WordPress admin area. Here's a great tutorial which will help you with database optimization: How to Optimize Your WordPress Database (3 Ways).
Test your plugin compatibility
Sometimes plugins are incompatible with each other. If you have a few installed and their settings clash, you may experience slowness in your WordPress admin area. In order to check if the plugins are at fault, you need to disable them all and see if the issue persists. If the WordPress admin dashboard is loading fast after disabling plugins - you should re-enable them one by one to check which one is causing issues. Here's an article which will give you two options on plugin testing: How to disable WordPress plugins without access to the admin page.
Important note: Due to the specific architecture of Elementor plugin, changing the plugin’s folder name can cause a website crash. Therefore, make sure not to change the Elementor folder name.
Upgrade your hosting plan
If you optimized your website and database and can see that your Resource Usage is still not within limits - it may be a sign that you outgrown your hosting plan. If you're looking to upgrade, you can check How to upgrade a hosting plan article for more information.