The latest Spotify version (188.8.131.524) uses too much RAM and gives the computer an excesive amount of work.
I have already disabled hardware acceleration and lowered Spotify's priority at Windows' tasks, but it's still the same. This didn't happen with Spotify's previous versions.
I installed an older version, and this worked nicely. However, Spotify will update everytime you close and re-open it, and uninstalling and installing another version everytime I turn on the computer is not practicable.
A good solution would be disabling automatic updates, but I didn't find a way to do it.