Recent versions of Docker Desktop have a "Resource saver"[0] mode. It will de-allocate memory and CPU when containers aren't being used. If there's a leaf icon next to your Docker icon then it's in resource saver mode.
I imagine over time it will get smarter too. Right now it waits for no containers to be running for 30 seconds and enables resource saving mode but who knows what could happen in the future. Maybe it can internally profile and estimate load based on evaluating runtime stats of your contains and dynamically change the VM's resources on the fly and then expose a +% over provision threshold option or a way to turn off dynamic resource saver mode.
I imagine over time it will get smarter too. Right now it waits for no containers to be running for 30 seconds and enables resource saving mode but who knows what could happen in the future. Maybe it can internally profile and estimate load based on evaluating runtime stats of your contains and dynamically change the VM's resources on the fly and then expose a +% over provision threshold option or a way to turn off dynamic resource saver mode.
[0]: https://www.docker.com/blog/docker-desktop-4-22