When using CDN, sites become very very slow. even sometimes return 522 error

When using CDN, sites become very very slow. even sometimes return 522 error
I tried close CDN (DNS only), sites are fast
why?

This might be due to network or firewall settings.

Please follow the steps in this post to solve your problem:

Thank you for your reply, I would like to ask more, if I closed CDN of Cloudflare, the network or firewall won’t return to me 522?

My guess is that your host is rate limiting Cloudflare IPs. Talk to them first or check the settings on your origin.

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