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Latency Table

Medium nanoseconds milliseconds
L1 cache reference 0.5 ns
Branch mispredict 5   ns
L2 cache reference 7   ns
Mutex lock/unlock 25   ns
Main memory reference 100   ns
Compress 1K bytes with Zippy 3,000   ns
Send 1K bytes over 1 Gbps network 10,000   ns 0.01 ms
Read 1 MB sequentially from memory 250,000   ns 0.25 ms
Round trip within same datacenter 500,000   ns 0.5  ms
Read 1 MB sequentially from SSD 1,000,000   ns 1    ms
Disk seek 10,000,000   ns 10    ms
Read 1 MB sequentially from disk 20,000,000   ns 20    ms
Send packet CA → Netherlands → CA 150,000,000   ns 150    ms

Mobile internet download speeds

Gen Short Technology Max Download Speed AVG Download Speed
2G G GPRS 0.1Mbit/s <0.1Mbit/s
2G E EDGE 0.3Mbit/s 0.1Mbit/s
3G 3G 3G (Basic) 0.3Mbit/s 0.1Mbit/s
3G H HSPA 7.2Mbit/s 1.5Mbit/s
3G H+ HSPA+ 21Mbit/s 4Mbit/s
3G H+ DC-HSPA+ 42Mbit/s 8Mbit/s
4G 4G LTE Category 4 150Mbit/s 15Mbit/s
4G+ 4G+ LTE-Advanced Cat6 300Mbit/s 30Mbit/s
4G+ 4G+ LTE-Advanced Cat9 450Mbit/s 45Mbit/s
4G+ 4G+ LTE-Advanced Cat12 600Mbit/s 60Mbit/s
4G+ 4G+ LTE-Advanced Cat16 979Mbit/s 90Mbit/s
5G 5G 5G 1,000-10,000Mbit/s 150-200Mbit/s