Sorry... conventional wisdom seems to be right here. No early optimisations is best. If a software grows like a tree, then only some branches, no, some leaves

Sorry... conventional wisdom seems to be right here. No early optimisations is best. If a software grows like a tree, then only some branches, no, some leaves will require optimisation. You never know from the start the route to those leaves because of the complexity of the software. Trying to optimise early is either like taking all possible routes but stopping after a short while on each. What I'm trying to say is optimisation is always a matter of _depth_, not of breadth. Finding the right direction and going all the way gives order of magnitudes better results then following best practices throughout the software.