Hello, Shapur II
For me, it's a no. Even if I know all the storyline from the start to the end if I haven't watched them episode by episode then I consider myself as not watching it or dropped it (if I watch some episodes).
But I do play with playback speed setting. I watch Fangs of Fortune and Good Manager in 2x speed but anytime I peel or cut fruits, vegetables, or meats I'm slowing it down to 0.5x speed. And I watch some Thailand and Chinese dramas in 0.75x, and some Japanese sad movies in 1.25x. I'm a non-English speaker watching drama in English subtitle after all.