Clips in "Musical mode" - CPU use and audio quality?

Does the simple action of checking the “Musical Mode” box for audio clips in the Media Pool engage the time/pitch shifting processing on that clip - even if that clip is not being tempo or pitch shifted anywhere in the project?

In other words, if you are not changing the pitch or tempo of audio files used in a project is it best to leave the “Musical Mode” box unchecked (for best audio quality and lowest CPU load)?

Curious about this too…