I'm having a debate with a colleague about whether a comma is needed in this phrase. I think it reads odd without a comma. From my understanding, 'further' is an adverb in this phrase, and 'faster' is an adjective. I know that adverbs can modify adjectives (in which case a comma would not be needed), but I think the meaning is lost if you don't have a comma in this phrase.
If anyone can clarify this for me, I'd appreciate it!