Computer latency at human scale

gistfile1.txt

    System event                   Actual latency Scaled latency   
    ------------                   -------------- --------------
    One CPU cycle                  0.4 ns         1 frame (1/60 s)
    Level 1 cache access           0.9 ns         2 frames
    Level 2 cache access           2.8 ns         7 frames
    Level 3 cache access           28 ns          1 s
    Main memory access (DDR)       ~100 ns        4 s
    Intel Optane memory access     <10 μs         7 min
    NVMe SSD I/O                   ~25 μs         17 min
    SSD I/O                        50–150 μs      0.5—2 hrs
    Rotational disk I/O            1–10 ms        0.5—5 days
    Internet call: SF to NYC       65 ms          1 month
    Internet call: SF to Hong Kong 141 ms^3       2 months

Taken from https://news.ycombinator.com/item?id=19445483