I would love to understand these people, really!

On a personal level, if thing works - I say, cool, lets focus on something else now.

But I have worked with people who are similar to the author and we will get into the conversation:

    - they: wait, but the bundle size is 2.4Mb, it can be improved a lot
    - me: by how much? and we have 10k users/day and we have cache policy setup
    - they: we can reduce it to 1Mb, imagine saving 10k*1.4Mb every day
    - me: yeah, but its not costing us much, if you focus on making it perfect your salary will cost us 2 years of outbound traffic cost.
    - they: no, but its not perfect

I admire those people, because they're valuable asset in some companies (e.g. Google scale, saving 1.4Mb for 1 Billion people every day is a lot), but my mind doesn't even want to think about what's perfect.

How do I get there? What are the resources I can read and learn from to look at things to make them perfect?