Most of the US follows At-will employment[0], so generally no performance plans are necessary.
This is not public. We've only used it twice, one person was suspected of misappropriation of funds (and later proven), and one that's currently in motion is an employee that misrepresented their technical knowledge i.e. cannot write code, convinced other employees to do 90% of their contributions.
I get that there is this impression of the US whipping everyone until they work themselves to death. Anecdotal, but I've never really experienced that. If anything, the folk in the US like being busy, and workplaces (at least in tech) are overly happy, in something that reminds me of a cult.
I have lived an worked in 5 countries in 3 continents and worked with people living in many more countries. In my own observations, the US colleagues have usually exhibited the highest level of happiness/satisfaction. They also tend to find their next jobs the quickest. And are paid the highest.
