Speed isn’t always enough as we find out from this gazelle after it gets taken by out by a lioness. Even though the gazelle was managing to outrun the lioness and looked like it was going to get away, it made a miscalculation and stumbled. It was all over at that point because the lion wasted no time in jumping on top of the gazelle and taking advantage of a hard-fought meal.
https://www.youtube.com/watch?v=ItSIIZn_xOc