By the way, this issue was already known:
http://www.zsh.org/mla/workers/2008/msg00930.html

2011/1/30 Julien Nicoulaud <julien.nicoulaud@gmail.com>

> Here is zprof after a "sudo apt-get install a<TAB>":
> http://paste2.org/p/1219060
> <http://paste2.org/p/1219060>And after a "sudo aptitude install a<TAB>":
> http://paste2.org/p/1219061
>
> <http://paste2.org/p/1219061>As you said earlier, all the time is spent
> in _deb_packages_update_uninstalled...
>
> 2011/1/30 Bart Schaefer <schaefer@brasslantern.com>
>
> On Jan 30,  1:53pm, cheer_xiao wrote:
>> }
>> } I check the documentation that apparently there is no instruction on
>> } how to load modules. Any hints?
>>
>> zmodload zsh/zprof
>>
>> The zmodload command ought to be cross-referenced from the "Zsh Modules"
>> section, but there is an index entry for "loading modules" that points
>> to zmodload.
>>
>
>