Why is geth --fast faster in downloading the Blockchain?

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In a blog, I read that the --fast flag will increase the download speed of Blockchain. I tried it, and it in fact was faster. My question is, why is it faster compared to the normal method (downloading without --fast flag)?
Jan 10, 2019 in Blockchain by slayer
• 29,260 points
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1 answer to this question.

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When you use the --fast flag to download the Blockchain, it downloads the state rather than downloading the full block data. This reduces the size of your blockchain dramatically and results in faster download.

answered Jan 10, 2019 by Omkar
• 68,860 points

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