Latency Numbers

1 CPU instruction 0.2 ns (1x)
L1 Cache 0.6 ns (3x)
L2 Cache 1.8 ns (9x)
L3 Cache 6 ns (30x)
Main Memory 60 ns (300x)
SSD 10-100 µs (20000x - 200000x)
HDD 1-10 ms
Internet: Japan to us-east-1 20 ms