Hey :) Thanks for the pointer. This was to beautiful to be true ! I searched around the web and found out what is actually happening in the background (learned something new and important so thank you!). And effectively It was writing to the cache and I wasn't aware that was a thing on Linux.
The command I used to track it down: sync & watch -n 1 grep -e Dirty: /proc/meminfo
. Took me some time to come across the right command and realize what's happening.
Will update my post right way (BTW is still hate MacOS !)
It don't like your comment...
"The dog likes his squeaky toy."
Like everyone is fighting over gender in human race, I would like that you finally understand that dogs/cats/cows even the squirrel in your garden... Those are sentient living beings... Stop treating them like just a fucking object !