You can see exactly how long the certain parts of compilation (BEGIN blocks, use statements) are taking using Devel::DProf. Just run using:

perl -d:DProf your_program.pl

..it will put info into a file "tmon.out". Then:

dprofpp -S (or -E or -I depending on what/how much you want to see)

at the command line (in the same directory you're running in) will give you lots of info.