Again, seeing that my first experience as a hobbyist was rewriting programs in assembly in the 80s that were too slow in higher languages on a 1Mhz 65C02 based computer, my second job as a professional was dissecting C compiler output to see how I could optimize the code generated or at times rewrite it in x86 assembly (custom printer drivers for industrial printers) and my third job was optimizing a proprietary compiler/IDE for Windows Mobile devices. I think I have a little more experience optimizing code than someone who has been doing it “for six years”.