Both are correct. I would probably say faster.

Thank you for your clarifying! It helps:)

As an English speaker, intonation & word choice are key - English is a very narrow language, meaning that it is easier to use but also easier to misinterpret so it's key to us very relaxed & friendly language - for example, "Let's go (name of person)!" "Come on faster faster we'll be late!" (although faster faster is grammatically questionable, it's jovial & can be interpreted as friendly) "Come on mate faster!" "Quickly now mate time's a wasting!" These are a few examples, it's always important to have a handle on intonation when speaking English, it can make or break the desired effect. Enjoy!