Memory usage drops after apt-get update

[mysugarape]

What happened

MainsailOS: 1.3.2 (bullseye) (fresh flashed SD card, so i guess its the latest, all uptodate )
Device: Raspberry Pi Zero 2w

i dont know if this is work as expected or maybe a bug or something else, but i want to let u know.

Issue:
I run MainsailOS on Raspberry Pi 2 zero w, wich works great since month. If i start the PI the Memory Load is at 53 - 54 % constantly after booting. However if i do "apt-get update" via SSH the Memory Load drops from 53% down to 33-34%, which is 20% less, and thats a lot in my view.

Iam not a linux pro, and dont know what the command do in the background, even there is no system update available the Memory drops. Even during printing it stays between 38% - 41%, without 59%-62%.

btw, thank u all for this work and effort u put in this project !

cheers,
Ron

What did you expect to happen

if this memory is not needed by mainsailOs, it should be available/free

How to reproduce

1. restart the pi
2. wait until booting is complete
3. open system loads tab, watch memory
4. open ssh, and run command: sudo apt-get update
5. Memory Load drops (for me 20%)

Additional information

No response