I used to want to be a perfectionist until I've learnt about the Pareto principle (the "80/20 rule"):
20% of the efforts make 80% of the results.
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So basically we're spending way more efforts into perfecting something than working on it.
Realistically speaking a boss will, most of the time, never notice the difference between something done correctly and something that has been perfected. When you spend time perfecting Project A it's as much time wasted not working on Project B.
When I 100% a game it's as many hours I didn't spend on another.
And, personally, I think that when a workplace says "give your 110%" it's a unhealthy mindset.