Slow Loading on Admin Pages
I’m using the Synapse Child Theme and the admin panel pages load very slowly - 10-20 seconds every time. The front end navigation isn’t a problem as things load quickly there - it’s when I’m working it from the admin panel.
To try and isolate the issue, I activated other Themes and the admin panel returned to very quick loading times. I then reactivated the Synapse Child Theme, which stayed snappy for a little while and then degrades back to the 10-20 second load times.
My site (http://creditpromart.com) is running the latest version of WP.
If you go to Appearance → Theme Options → General Settings → Customization
Try changing to ‘Customization Mode’, save and see if that has any effect.