Also no one cares about your loop optimization if you're wasting 20 seconds in the network because you aren't using your ORM right. Also no one cares about your

Also no one cares about your loop optimization if you're wasting 20 seconds in the network because you aren't using your ORM right. Also no one cares about your memory efficiency if you're sending megabytes of json to the client. Include network time in that as well. Also no one cares about your optimization if the GC goes postal. I maintain 2 positions, though we can discuss about the details: - There is unoptimized code, and there's just stupid code. I'm fine with raw code without optimizations. But I hate code making all mistakes from the last 2 years of the company, and the last 10 years of experience in this industry again and again and again. - All other optimization should be done based on production monitoring. Or, production-like loadtests if you have that luxury. For a new feature, good monitoring will allow a good developer to increase performance significantly with very small changes. For a legacy clusterfuck, good monitoring will allow devs and ops to build a strong case for a bigger rework. Which will result in much larger benefits for both teams.