I just enabled Cloudflare on this site and it’s now INCREDIBLY slow - takes almost 1 minute just to load the site. Before I added Cloudflare it was very ffast. This is the 10th site I’ve added to Cloudflare and the only one that’s had this issue, is there something new they added that’s causing this?
May I ask you to post and share your domain name in bracketed dot [.] notation here with us so we could double-check, troubleshoot and provide some feedback information? 
Before moving to Cloudflare, was your Website working over HTTPS connection?
Are Cloudflare IPs allowed at your origin host/server to connect, or at your firewall?
Sure it’s postcheetah[.]com
The site was working via HTTPS before cloudflare
We have no restriction on Cloudflare IPs