This may be useful when doing tests of a web site’s response time. You can add “time” before any command to measure the time it takes.
time wget http://www.aip.im -q --output-document=/dev/null
real 0m0.349s user 0m0.000s sys 0m0.004s
The “real” value indicates the time it took to receive http://www.aip.im.