I agree that sometimes the language you use does not matter, but how the developer does not care about the speed of his application. I am asking why the develop

I agree that sometimes the language you use does not matter, but how the developer does not care about the speed of his application. I am asking why the developer is wasting those CPU cycles. Anyway comparing web site backend with compiled C to interpreted PHP is bad example when the language really does not matter as C is faster than any other language and PHP being one of the slowest. Comparing python and php is another thing when both of them actually are interpreted languages and used for scripting web servers. Anyway this is one place where personally even I do exchange cpu cycles for speed of development. The SQL queries will affect the same both of those languages. Yes you can make any code to be fast it only needs to be optimized and compiled to binary.