I'm not an expert in system stats but by the looks of things, your system usage is high because of IO wait. This is the system waiting for input/output operations to complete. If in netdata on the right hand side you click on steamcache, I would imagine you will see nearly 100% cpu usage on this container. To fix this there are several things you can look at. One of your disks may have an issue with it, slowing down read/write operations, you may also be running low on RAM in the system. I have not seen this issue before with Steamcache so I don't think that it is anything specific to steam cache causing an issue, it has just highlighted the problem. When building a NAS IOWait is an issue because most the of the applications you use a NAS for will at some point perform large read/write operations to disks. So I suggest that you do some googling to find a solution as there is no deffinitive fix for this. If you do need more help however, just ask! 🙂