By default, dircolors will find the loca- tion of the ls binary at the time it is run, and include it in the shell function or alias, which for most shells results in a significant speed improvement.
(dircolors; will find; the loca- tion of the ls binary at the time) (it; is run; T:the time)
dircolors it
will find is run
the loca- tion of the ls binary at the time
T:the time