There are two working examples in the documentation - what exactly do you need in addition?

i search for this http://curl.haxx.se/mail/lib-2002-04/0223.html
on CPAN pure documentation, working examples but there are no fully help about all params
hmmm, now i have a problem like this
Undefined subroutine &Curl::easy::getinfo called at p.pl line 62
Line 62: $start = $curl->$getinfo(CURLINFO_STARTTRANSFER_TIME);

but $bytes = $curl->getinfo(CURLINFO_SIZE_DOWNLOAD); works fine

This article is from 2002, a lot can change in 9 years. The module was renamed from Curl::easy to WWW::Curl::easy in 2003, prior to it being uploaded to CPAN. Then another change to WWW::Curl::Easy in 2005, WWW::Curl::easy was removed in 2008. As has already been pointed out, WWW::Curl states:

"This module provides a Perl interface to libcurl. It is not intended to be a standalone module and because of this, the main libcurl documentation should be consulted for API details at http://curl.haxx.se. The documentation you're reading right now only contains the Perl specific details, some sample code and the differences between the C API and the Perl one."

It may be worth actually reading and understanding a modules documentation before writing it off as "awful".

don't look at outdated info, see this

I need to benchmark my internet conncetion ( download file, calculate size and time and recive a speed.

FWIW: wget does this for you every time you use it:

wget -c http://search.cpan.org/CPAN/authors/id/R/RJ/RJBS/perl-5.12.3.t
+ar.gz
Connecting to ftp.esat.net|193.120.14.241|:80... connected.
HTTP request sent, awaiting response... 206 Partial Content
Length: 14933787 (14M), 12347274 (12M) remaining [application/x-gzip]
Saving to: `perl-5.12.3.tar.gz'

40% [++++++++++=============>                                   ] 6,11
+6,789    
200K/s  eta 44s     ^
[download]