I was able to remote in and find out what was going sideways with the OP’s system. I’ll fill out the details in a bit, but there is the keys.
mods-enabled/php5.conf set handler
9.4
sites-enabled/001-fog.config
It appears to be an issue with at least debian 9.4 at the moment where php-fpm wasn’t being enabled causing the sluggish UI and high apache usage.