Problemution (problem+solution) found!
I've tried��
clearing package cache, image cleanup -> size decreased a little.
unloading all my packages -> ��size unchanged.
Yet i haven't thought��as my doing��about TilingWindowManager i've installed! It has an option for snapshooting worlds, it's possible i've been triggering it involuntarily with some shortcut i wasn't aware of, anyway if this was the case i get no visual notification when snapshooting (like the one you get when saving the image).
disabled��TilingWindowManager -> size decreased about 200 MB, down to 20 MB.
Also the discussion brought up very interesting��msg collaborations��snippets and system features for future reference!
Best,
Laura