When yaourt install packages from AUR, he do this steps:
[1]. Download archive file with PKGBUILD to install
[2]. Extract package and do compile || download & etc
[3]. Compress package to install it with using packman
[4]. Run pacman
[5]. Pacman >extract< files, and install hims.
I think if we can remove [3], this is speed up installing || upgrading
process from AUR.
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Best regards,
Timofey.