Do I always have to think about performance?

Question

I come from a DBA world and performance has always been an obsession. I am turning to development and I always think about performance, constantly, all the time.

Reading

Answer 1

I had a phase where I was absolutly paranoid about performance. I spent so much time trying to improve performance that my code never actually progressed. Don't get into that habit :-)

Code, THEN optimise, not both at the same time.