iPhone keyboard lagging after iOS 18 Update

Hello guys, I have an iPhone 13 Pro Max and I've been suffering for the famous keyboard lag since I've updated to iOS 17 one year ago. In my case the problem starts to occur when I enable 2 languages on my keyboard (for me, Italian and English). I hoped that with the iOS 18 update and the introduction of the bilingual keyboard this bug would finally be fixed but sadly, that was not the case. I've tried every possible troubleshooting known for this issue, yesterday I've even reset my iPhone, but again, without success. Is someone experiencing the same issue even in iOS 18? And have you managed to fix this? Thank you.

[Re-Titled by Moderator]