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Sadly I never really used canvas before, so I don't know how to hide the dark-green afterglow.

Why is this using a map when the result is just being thrown away? Imagine how left out forEach feels :(.

Also: the afterglow is caused by the main loop filling the entire canvas with a black rect with very low opacity. The result is that after so many frames, everything but the actively drawing characters are much darker. Increase the opacity if you want to reduce the length of the effect.

As he wrote in the fiddle's test he worked from the deobfuscated code of the original item, which probably used map to save 4 characters

I didn't mean the "rgba()-fillRect-command", but why the font blur is still slightly visible as dark green, while the character itself has already faded to black.

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