One thing you might also consider, and please don't take this personally, cause I might be way off -- It could be that you're slow, or perhaps, that the 'extra effort' you're putting in to things means that they're missing deadlines or are unable to start the next thing.

The key comment though is amorphid's, I think, that you're being paid to do what you're told. If that makes you unhappy, then as mentioned, there are probably a ton of places that would be happy to have you.

Before that happens, I would have a conversation with your boss and see why they keep asking for the rush treatment. If it's a deficiency with you, that's something you can work on and improve. If it's because they don't understand the value of a good design, that's something you can work with them on and hopefully improve their understanding. It might be that there's a bigger mission that your boss knows that you don't? It could also be that they're idiots and you're not.

Either way, I would put as much care into the working relationship as you already do the work itself.