I know for a fact that at Meta (Facebook), even if you literally are a genius and were promoted twice in 2 years you wouldn't be doubling your total comp.
Note, it’s not just the initial promotion. It’s the wider compensation band it opens up.
It’s not the initial promo that necessarily gives you doubling. It’s the wider compensation bands the promotion opens up. Sustained performance can have high upside in a 2-4 year time horizon for high performers.