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Why does Python use only 4% CPU?

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I have a Python script that counts the occurrences of every k-long substring in a very large text. This is how it does it, after having stored and deduplicated the substrings:

counts = {}
for s in all_substrings:
    counts[s] = full_text.count(s)

I was surprised to see that this script uses only 4% CPU on average. I have a 4-core, 8-thread CPU, but no core is used at more than single-digit percentages. I would have expected the script to use 100% of one core, since it doesn't do IO.

Why does it use so little computing power, and how can I improve that?

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