Yeah, support is pretty basic. Check your theme... Check your plugins.
I am not an IT expert, nor I know much about servers, but even on a shared hosting support should be able to tell me, what's is slowing down the server.
I only want to hear "it's this plugin". I don't want to hear why it is this slowing it down exactly. I only want to know, what is causing the problems. This should be covered by basic support in my opinion.
All my sites never had any problems. They alway were fast.
Take a look at the Screenshot. You can see
that around 6th April something happened.
https://imgur.com/a/ftdx9t3
Btw: site is hosted on hawkhost.