A catalyst for stock performance could be just ahead...Nvidia (NVDA -3.38%) has delivered a fantastic win to investors over the past few years -- whether you got in on the stock five years ago and watched it climb a mind-blowing 1,200% or you bought early this year and have benefited from a double-digit gain so far. As long as you've held on to this top artificial intelligence (AI) player, with the idea of accompanying it over the long term, you've likely watched your investment grow.But, if you haven't yet ...