For what it’s worth, in most cases, “with cause” is misunderstood. “Fired with cause” on UI’s end typically means the employee was fired for something egregious and/or illegal. Stealing company property, committing fraud using company resources, gross negligence leading to someone getting injured, etc… Simple underperformance isn’t typically enough to exclude you from claiming UI.

Even though people will colloquially say that being let go for underperformance is “with cause”. It’s typically not correct, and won’t hold water if the former employee decides to appeal the initial UI denial. But companies have a vested interest in supporting that colloquialism, because if people believe they don’t deserve UI then they won’t try to claim it, (or won’t try to appeal it when their initial claim is denied,) which keeps companies’ UI payments low.