[greyfade]

I just consider what code would be correct. Does it do the right thing? Is it concise and clear? Is it stable, given all expected inputs?

I worry about optimization and all of the other details later.

[rhizome]

"Concise and clear" is an optimization itself.

[gbog]

No. Concise means dry, which requires a lot of refactoring on the fresh meat, and it is not optional. Clear means readable, which is necessary too, lest your hope for your code is to never be read again. I mean used.