These are my pictures of a similar situation. However I am only using Firefox to browse the forum and , now, typing this.
I'm now using 1.287 GB 31% of 4GB as I type this.
I noticed I'm using twice as much CPU as you with only a few more processes running.
As you say I think running the snipping tool and displaying task manager puts up the RAM use slightly.
It's a bit better than Vista x64 but not a great amount less.
Best wishes, John