Amazon Music appears to be continuously consuming over 25% of CPU utilization, even while music is not being played.
I contacted tech support about this issue using the Amazon support services Chat feature. I was told that the app was probably "updating the library" (or something along those lines), and that after a while I would see the CPU utilization drop to something very low. Even after 48 hours, the CPU utilization was still over 25%.
After some playing around with various software development tools, it appears to me that this has something to do with some of the "adds" or banners that appear on the user interface of the app. I'm still doing some diagnostics, so I have no hard facts yet.
Exactly the same issue for me. Just logging it here to try and get some Amazon input. I've got a Windows 10 laptop which I only use with Spotify, and recently wanted to try Amazon HD (I already have Prime and saw the 90 day free trial). Basically my laptop from the box only has the OS and Spotify (and now the Amazon app). The OS is up to date. I've not downloaded any music from Amazon, there is no "library to sync". I launch the app, it uses 35% cpu and never drops. If I minimise it, it still uses the same CPU. Ive got the most vanilla laptop in the world, it has two installed apps on it, and yet Amazon music is unusable on it. Spotify uses 0-1% cpu when minimised, and about 10% maximum when playing. Obviously wont be using HD as Im sure it will choke the laptop.