PageSpeed find that on my website :

Allows registering an unload listener

The unload event does not fire reliably, and parsing it may prevent browser optimizations such as caching of previous and next pages. Use the pagehide or visibilitychange events instead. Learn more about offloading event listeners
Source : https://www.internazionale.fr/uploads/javascript_global/root_library.js?v=950d8212841685401657

 

Is it "normal" ?

I have tagged our developers who are better placed to advise on this for you.

It's something we're aware of and have on our list for improvement, however it's part of a very central library we use so it isn't an easy task to remove it.

Ok thanks for your lights.