I have a sys with Win11 , 16GB Ram , Corei5 , I installed Ignition 8.1 earlier.
Eventhough , everything is closed , and my gateway isnt running.
The platform consumes a lot of memory..........
It consumes as much as you configure it to consume, per the settings in ignition.conf.
Based on what I can see, it seems you have a laptop w/ 8GB of ram. That's enough to run a typical gateway, but not much else. Use a separate machine from the gateway for designer and client UIs.
I do not thing the gateway is stopped. I just tried it on my computer, when you stop the gateway, it went away.
Ignition website has step by step to stop the gateway.