Cloudflare making website slower

Hello,

I run a platform based on the ILIAS software for a school, and I use Cloudflare to protect it from attacks.

Unfortunately, Cloudflare proxying the traffic makes the site significantly slower, please compare:
with Cloudflare proxy - https://ilias.sufband.net
without CF proxy - http://ilias_noproxy.sufband.net (no https)

Cloudflare has helped greatly with HTTPS which means that I may encounter some problems with HTTPS without CF proxying (easier with CF proxy), which is why in this case I have provided the non-proxy link with no HTTPS.

Would anyone be able to advise what I could do to fix this please? I’ve never seen it this slow before.

Thank you,
Jakub

updated as IP address was redacted

So, you don’t have an valid SSL certificate installed at your origin host/server for your domain name and you are using Flexible SSL option under the SSL/TLS tab of Cloudflare dashboard for your domain name? :thinking:

No - I’ve got ‘full’ option enabled with SSL on the origin server.

Last time I turned off proxying there was a HSTS error which made the site inaccessible. I would work to fix this if I had to remove CF proxying but this is a last resort. Surely this wouldn’t be the issue causing the slowness?

I’ve also updated the link for comparison as the IP was redacted.

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