I gave it a shot and read 100 chapters because the author said the protagonist is OP and doesn't hide his powers much. Well, that was a lie.
The protagonist is weak and stupid. Let alone being OP, he's not even the top of his class. He's also very lazy.
He's described as someone more mature than his age would indicate, which is 16, but he acts like a 12 year old, so that's also a lie.
As for pacing... after 100 chapters, I feel like the novel hasn't even started yet. He has gone to school, been insulted the whole time for being trash, which is true, and now he's playing around in some random tower to find some healing elixir. So I'd say it's snail pace. Veeeeery slow.