Slow website loading only while proxy is turned on

I apologise for the confusion with my previous post.
I have here a live (but old, soon-to-be reworked) site: https://ha5kfz.proc.hu/

This is the performance of the site without the CF proxy:

And this is the performance with the proxy enabled:

As you can see, the site loads for 10 more seconds with proxy.

This happens, when the proxy is enabled:

The browser has to wait seconds for the server to answer,

I also get a bunch of 522 errors.

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