Erlang/Elixir string performance - can this be improved?

Questions / Help
,
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Hi, a friend of mine sent this over, so I gave it a try: https://gist.github.com/evadne/43e79dd51c068dc19e42086cdbecc8a7

FWIW

$ curl http://teralink.net/\~serpent/words.txt > words.txt

$ md5 words.txt 
MD5 (words.txt) = 640ef9e082ef75ef07f0e9869e9d8ae2

$du -h words.txt
217M	words.txt
Execution

$ elixir ./count.ex ./words.txt --sort > out-sorted.txt
Started
Using 4 Workers
Processing: 4.748574s
Load Results: 0.820397s
Order Results: 1.99405s
Print Results: 3.136065s
Total Runtime: 10.710908s

$ elixir ./count.ex ./words.txt > out.txt
Started
Using 4 Workers
Processing: 4.944752s
Load Results: 0.836416s
Print Results: 2.556994s
Total Runtime: 8.343633s

$ wc -l out*
  557745 out-sorted.txt
  557745 out.txt
 1115490 total

$ head -n 5 out-sorted.txt
1033175 0
103404 00
353 000
752 0000
19 00000

Please let me know your thoughts. Thanks again!

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