That is…shockingly slow. I get a quick redirect to HTTPS, then it takes a minute or so before it starts receiving data. Sometimes showing a 524 timeout.
Your best bet is to open a Support ticket so they can watch the connection.
To contact Cloudflare Customer Support, login & go to https://dash.cloudflare.com/?account=support and select get more help. If you receive an automatic response that does not help you, please reply and indicate you need more help.
A 524 error indicates that Cloudflare made a successful TCP connection to the origin web server, but the origin did not reply with an HTTP response before the connection timed out. Review the suggestions in this Community Tip for troubleshooting ideas.