I have the same issue - it is a brand new laptop with i3 12th gen 1215U processor, with 8 GB RAM.
The RAM usage is always 60% or more -- with no other application running.
Even the CPU usage shoots up randomly with no apparent reason. Here I have only one firefox tab open and nothing else.
In the user tab, the total RAM used is around1.2 GB under my user ID. Still the usage is 67%.