I wonder if someone can explain the purpose of fastLED.delay(n)?

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I wonder if someone can explain the purpose of fastLED.delay(n)? What does it offer above a simple delay(n) ?

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This sentence is important:

The more often your code calls FastLED.show(), or FastLED.delay(), the higher-quality the dithering will be.

as I don’t use delays at all, but keep a very high loop speed.

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Thanks guys!
Geo