Why Spotify Helper consumes 90% of my CPU?

Have you tried searching for something like "high cpu usage spotify helper" and following the troubleshooting steps?

Odds are, not everyone using Spotify has it use 90% of the CPU as otherwise few people would actually use it, I certainly wouldn't.

Personally, Spotify is right now using about 3% of my CPU when playing songs on Linux, Spotify 1.1.72.439, which doesn't seem so bad to me. It uses more RAM than expected though, but not really a problem that makes me go "How do people accept such abuse?!"

Edit: if you want to solve the problem for yourself and like the service Spotify while not liking the client they offer, you can try open source 3rd party clients based on librespot (https://github.com/librespot-org/librespot/), some of them work really well.

Is that 90% or uh, that weird not actually 90% of 100% thing and actually a dynamic 90% of one thread at that time slice at that frequency?

But disregarding that, I completely agree with you and that's why I don't use any of those services. Just download all of your music as flac and play it with whatever player.

it is because they adopted leetcode to screen people

all the competent engineers who have no time for irrelevant repetitive code interviews were filtered out