Your WP Dashboard is running slowly

    The reasons:

    1. You're using server with performance restrictions
    2. Any conflicts with another plugins 
    3. You're set High Performance profile in Setup Wizard, but your server has a low performance 
    4. You have active Server Cache enabled, some versions of server caches may cause conflicts
    5. Your hosting blocking some required requests
    6. You have enabled some wrong functions in your WordPress
    7. Incompatibility with asynchronous requests

    8. Wrong requests type, try to use internal requests (change here and re-check)

    Try to use Object Cache (it can speed up your admin panel)

    Try tu use this guide:
    Published