This was one of the weirdest things I had to learn when I was learning spanish. The sounds are much faster but the information density was similar. For me as an english native speaker it felt like I was listening to a machine gun at first. Eventually I trained my ear and now both languages sound the same speed.
I recently had a conversation with a native Spanish speaker who lived in Japan and spoke Japanese fairly fluently. He said the exact same thing, it was surprising how similar they can be in this regard
Spanish and Japanese use the same sounds. For the most part, anyway; there are probably a few exceptions. This was unexpected and utterly blew my mind as a native Spanish speaker when I took Japanese lessons.
Take the longest, most complicated Japanese word. Write it out in romaji (Latin letters). And ask a native Spanish speaker to pronounce it. One who knows nothing of Japanese. They'll pronounce it pretty much correctly. I was fascinated.