I don’t have any caching on this site. But I understand if you can’t do much about the installation.
Postman SMTP also seems to be using up a lot of memory. When I activate the plugin I get this error under WordPress News on my Dashboard.
Fatal error: Allowed memory size of 67108864 bytes exhausted (tried to allocate 1966080 bytes) in […]/wp-includes/SimplePie/Item.php on line 2736
It is fine when I first activate it, but then a day later, I start to get this error. Maybe the memory usage has something to do with my installation problems?