Because it's irrelevant, in this case? My experiences are with >3GHz Haswell and Ivy Bridge quad cores.
Problem is coders have to stop assuming that everyone has a >3Ghz processor, and even then, why code stuff so that it uses all of it, they need to realize that people don't have a computer to run ONLY their program but to run many things at a time.
Not even sure how one even manages to make something so bloated, it seems to me, it's actually more work to make something super bloated than nice and light weight. The more bloat, the harder it is to maintain. Take something like a website for example, there's absolutely no reason to use 10,000+ lines of java script hosted across 10 different domains just to do something as simple as a hover image viewer or drop down menu. You can probably code that in a couple 100 lines, host it locally, and it will be MUCH faster and easier to maintain.
