Ruby on Rails latency chart

rails_latency.txt

Latency Comparison Numbers (~2024, compiled by www.speedshop.co)
----------------------------------
local variable or CONSTANT access           50 ns
thread variable access                      75 ns
Logger.info('string')                    1,000 ns         1 us
Parse 1kb JSON                          25,000 ns        25 us
Thread.new                              40,000 ns        40 us
User.find(1) (cold, sqlite3)           100,000 ns       100 us
Allocate 10,000 objects                250,000 ns       250 us
AR Querycache HIT, postgres            250,000 ns       250 us
Rails.cache.fetch(str key, 1kb val)    500,000 ns       500 us
User.find(1) (cold, pg)              1,000,000 ns     1,000 us    1 ms
`echo 'shelling out'`                5,000,000 ns     5,000 us    5 ms
Allocate 1 million objects          30,000,000 ns    30,000 us   30 ms
p50 Rails response                  75,000,000 ns    75,000 us   75 ms
react route change (w/o fetch)     100,000,000 ns   100,000 us  100 ms
elasticsearch query                200,000,000 ns   200,000 us  200 ms
call to 3rd party HTTP API         250,000,000 ns   250,000 us  250 ms
react route change (w/fetch)       500,000,000 ns   500,000 us  500 ms
download + compile SPA (small)   1,000,000,000 ns 1,000,000 us 1000 ms
typical Largest Contentful Paint 2,000,000,000 ns 2,000,000 us 2000 ms

Notes
-----
1 ns = 10^-9 seconds
1 us = 10^-6 seconds = 1,000 ns
1 ms = 10^-3 seconds = 1,000 us = 1,000,000 ns

Credit
------
By jboner:                  https://gist.github.com/jboner/2841832
By Jeff Dean:               http://research.google.com/people/jeff/
Originally by Peter Norvig: http://norvig.com/21-days.html#answers