Should Slow Rolls Be Penalized?

No, I don't think so. What I can tell you is that sometimes it gets too slow and that puts me in a bad mood, why do I ask? Come on, what do you need to think so much about? Do you think that your opponent sees your gestures and that's why he wouldn't pay your bet? They play as if it were live. It's online poker man.
I don't know if it happens to anyone else.

Penalty doesn't make sense. It's looked down upon by many professional players and that's good enough embarrassment for slow rollers.