One major thing that can delay the process of communication cross-culturally is the language barrier. I mean, imagine trying to have a deep conversation with someone who speaks a completely different language, it's like trying to understand a foreign song without the lyrics. You might pick up on a few words or phrases, but the overall message gets lost in the mix.
Another thing that can slow things down is cultural differences in communication styles. For example, some cultures are more direct and to-the-point, while others are more indirect and polite. It's like trying to dance with someone who has a completely different rhythm, you've got to feel the beat before you can move in harmony.