Investors should still proceed with caution when it comes to this company.Since the start of 2023, shares of Carvana (CVNA 0.29%) have skyrocketed nearly 1,400% (as of April 16). During that same time, the Nasdaq Composite index is up 52%. It would probably take you some time to find a better-performing stock in recent times. Even Nvidia, the best "Magnificent Seven" stock since the start of last year, has climbed only 500%.This puts Carvana in a league of its own. But before you rush to buy this unstoppabl ...