Comment by hunterpayne

Sorry but you are just wrong. There are very few coding changes that you can make to fix performance issues that users will notice. Almost all the optimization changes they might notice are architectural changes. This is because CPU bound code is very rare and if you have that case you are probably doing something wrong architecturally. Code being memory bound is 99.999% of the time what is happening. And optimizations to memory bound code are almost always architectural too. Any coding changes, even to a huge platform's codebase can probably be found and fixed in a couple of hours. Anything non-architectural that takes longer than that, is about as likely to create noticeable improvement as you winning the big jackpot in a lottery.