Macs have never been about spec sheets and higher processor speeds and yet have always outperformed their comparable PC counterparts for years and continue to do so. But as an aware Mac user, it is important to understand the specs of different core components of your Mac and their effect on your usage and the machine's performance in general and there are a lot of myths waiting out there to be debunked or proven right.
Macworld recently put an article together with the top six myths and have done DIY kind of experiment on trying to analyze the effect of certain Mac components like the processor, RAM and the hard disk on system performance. While some of the results (at least for me) were straightforward, like more processor cores do not mean better performance if the software you are trying to use does not take advantage of it (like better multi-threaded optimization), some of them were good to know, like using an external monitor does not slow down your Mac (at least not to a discernable level), a couple of results related to the SSDs (Solid State Disks - hard drives) were new to me.
The first surprising result was how larger SSDs (in terms of capacity) were better in performance, both in terms of speed of operation (write speeds and not read speeds) and in terms of reliability, than their smaller capacity counterparts. The second result also related to the SSDs, was that the traditional (rotating magnetic) drive slowed down when filled more (closer to its full capacity) and the SSD did not, even when filled almost 90% of its capacity.