Since a couple of days the Acymailing 5.10.20 backend is brutally slow. The update check is spinning endlessly end presents then "Could not load your information from our server" in red color. It takes several minutes to save or cancel configuration. The site proaudio.de runs on a dedicated managed server with PHP 7.4.x and 512 MB memory_limit
The same slow backend behavior is on another host, namely tuete.ch.
kind regards
Markward