I have been using gkrellm for at least the last 25 years or so. I very much like being able to see what my system is doing at a glance and no other system monitor comes close to being both as detailed and compact.
Never in a way that doesn't noticeably chew additional CPU though, and definitely not for both use cases. It upsets me each time I reply "no, not happening without patches". Perhaps it is time to release an Electron version or one that just burns a whole CPU core so it isn't lost forever ;)
¹ It used to just be people with crazy setups, now it is basically any screen given their higher DPI.
² As it is right now I don't even have a system that I can use last release on.
There's nothing to integrate, it just runs and sits there doing its job.