https://www.youtube.com/watch?v=07NMuobVVwQ

This channel has many comparison videos like this one.

Loading times and 1% or 0.1% low FPS are usually hit the hardest and those stutters are the most immersion-breaking.

False. There's lots of side-by-side recordings of Denuvo and non-Denuvo versions of games on YouTube clearly showing that Denuvo does impact performance.