When they run alongside each other at the end of the episode, Lion-O is able to outpace Cheetara thanks to his determination to win the race. Most importantly, her incredible speed cannot outmatch a strong will for victory. After that, Cheetara runs as fast as any ThunderCat.
For starters, her speed only lasts for a short period of time. However, as Episode 42 of the original 'ThunderCats' demonstrates, Cheetara's amazing agility is not without its disadvantages. It comes as no surprise that Lion-O sweats bullets when he learns that one of his trials to become the official leader of the ThunderCats is a race against Cheetara. After all, she is based on the cheetah, the fastest land animal on Earth. If there's one thing that Cheetara has going for her, it's her speed.