What does "in a blur" mean in the sentence below? Is it a slang? Does it mean "very fast"?

"I grinned as I counted more quickly and ran the numbers together in a blur."

Source: Counting Stars (By David Almond)

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  • Imagine a picture were taken of you using an old-timey camera with a slow shutter speed. If you were moving quickly the image would be blurred. – Hot Licks Mar 26 '16 at 12:29

Yes, in this context it does mean very fast, so fast that you are moving too quickly for the world around you.

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