I've noticed during the week that the game menus were slow and at a moment don't respond to my clicks until I refresh the page, am I the only one ?

I'm using Chrome and I never experienced this problem with the game...

prolly a chrome issue tbh

Well, I've tried on Edge, it's faster but sometimes there it's still blocking, with the message appearing "the page doesn't respond" asking then if I want to close it or wait...

It’s probably an issue on your end. MFN works fine for me on my devices.

I’d suggest checking the Wi-Fi, checking your website extensions, and checking your device apps.

I hope this helps