Unfortunately, this suite is in french only for now and I don't plan to share before I'm sure all is perfect.
Rainmeter.exe only uses 52MB of RAM and about 0.6% on average of my CPU and go to 4% during a few seconds every 30 minutes when my weather skins update. My suite has 42 skins loaded right now and always run on background. I'm pretty proud of the job I did about optimization.
When foobar is running on background. You have feedback and total control on it with the skin at the top left corner. Controls displays when mouse hover.