Testing shift8 cdn

Hey, i want to thank you for a wonder-plugin because i tried in the past your plugin and i liked it. but… right now something is wrong and i have a question.
For testing purposes i need to completely disable connection between my site and shift8 service, how do i do it? I don’t know IPs to block. I mean i know how to remove API key and site itself from dashboard of shift, but what if my site is still connected? I need to disable connection without deactivating plugin for testing purposes.
I just think that if i remove API key, site is somehow connected. So i wanted to know if its possible to block plugin without deactivating.
By the way, my site doesn’t display pictures with CDN on and people are keep saying and trying same as me, but that’s not important question right now.

In the plugin settings ,there is a big on/off switch that will turn it off without having to deactivate the plugin. Have you tried that?