I know a way how get rid of all constants and still have the best performance! :P
Are you intrested?

The author didn't describe well enough the timings he told in the previous Kata of the series.
I was disappointed until I solved that Kata.

Explanation for those users, who as me, jumped onto 3rd Kata right away:  
There are 3 separate timings: short, middle, and long.  
All 3 for dots and short and middle for dashes.  
Length of short and middle timings (almost) similar for dots and dashes.
I hope this description helped someone.

I didn't understand the issue untill I did the previous Kata in the series.

BTW, I have fixed an issue in my GitHub repo, but didn't publish it yet.
I want to get rid of 40 bytes allocation and clean up the code.
GitHub: https://github.com/dgzargo/CodeWars-MorseCode-Callange

I have written to Discord chanell #contact-mods. Waiting for response.
https://discord.com/channels/846624424199061524/850434952813740073/1234319106099118122

GitHub Issue: https://github.com/codewars/codewars.com/issues/3204

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This code made to not allocate memory.
Allocates 40 bytes actualy. And it does the work for less then 1ms