DNS optimization configuration

website very slow while no modification have been done
on pagespeed my website reached 99/100 mobile/desktop and I checked a bit after it dropped to 40%/60%(PageSpeed Insights).
Do you know if I should disable the html/js/css minimization or something else ? I have WPfastest CACHE plugin it might be in conflict with it for some reason?

Thanks for your help!

Just for the sake of good order. You have an invalid SSL certificate on your server and an insecure encryption mode on Cloudflare.

Where did you get that information from please? Because I checked it and everything seems to be fine.

Run this command against the site hostname and IP address of your server:

curl -svo /dev/null https://www.example.com --connect-to :: 2>&1 | egrep -v "^{.*$|^}.*$|^* http.*$"

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SSL is not really a plugin but is a technology which runs on your server and which is backed by a certificate which you need to get issued from a certificate authority. In your case you do not have such a certificate and would need to get that first from your host.

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