Native Spanish rarely feels "clear and slow" — but the problem usually isn't raw speed.
It's connected speech, not velocity
Words link, sounds drop, and syllables blur together. What sounds impossibly fast is mostly this connected speech — not people talking at superhuman pace.
Your ear is still segmenting
Early on, you process word by word, which can't keep up with a natural flow. Listening fluency is learning to hear groups of words rather than individual pieces — and that comes with exposure.
How to train it
Listen a lot, learn the common reductions and linkings, and resist the urge to panic when you miss something. Repeated exposure is what retrains the ear — there's no shortcut, but it does work.
Missing words is normal
You don't need every word to follow the meaning — native listeners don't catch every word either. Aim for the gist first; the detail fills in as your ear adjusts.