История изменений
Исправление Chaser_Andrey, (текущая версия) :
тут уже была дискуссия https://bugs.gentoo.org/show_bug.cgi?id=431484
Some of the performance difference for Portage is related to that fact that it's possible to modify ebuilds at any time, and Portage is expected to detect these changes automatically and account for them. The makes access to the available package database somewhat less efficient than it would be for something like Debian APT.
Исходная версия Chaser_Andrey, :