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Numbers that every computer engineer should know, according to Jeff Dean

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L1 cache reference: 0.5 ns
Branch mispredict: 5 ns
L2 cache reference: 7 ns
Mutex lock/unlock: 100 ns
Main memory reference: 100 ns
Compress 1K bytes with Zippy: 10,000 ns
Send 2K bytes over 1 Gbps network: 20,000 ns
Read 1 MB sequentially from memory: 250,000 ns
Round trip within same datacenter: 500,000 ns
Disk seek: 10,000,000 ns
Read 1 MB sequentially from network: 10,000,000 ns
Read 1 MB sequentially from disk: 30,000,000 ns
Send packet CA->Netherlands->CA: 150,000,000 ns

(1 ns = 1 * 10-9 s)

These numbers have been updated by others :
https://colin-scott.github.io/blog/2012/12/24/latency-trends/

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