Pb size of iso created (increasing too much)

Hello

My original system (Xubuntu 18.04 fork) is about 1.8 Go, I just added 150Mo of files in /etc/skel and after building, the created iso is about 2.7 Go .... wahow !...

Of course I excluded /swapfile in etc/PinguyBuilder.conf.
The filesystem.squashfs created with PinguyBuilder-menu-based-5.2.1_all.deb is about 2.4Go ... seems something is not good ...


Thank you for any information that may explain more why the iso file is so big and how to decrease it.

Wish you a great day