I feel that with all the additional apps pre-installed, and relying heavily on deriving elements from Ubuntu and Gnome, elementary must be heavy.
So I would like to know an as-quantitative-as-possible analysis of how heavy the OS is on RAM (and may be the system in overall) compared to Classic-Ubuntu/Gnome-Ubuntu. This is a problem that every user who is stunned by the awesomeness of Pantheon would like to get an answer to, before switching their OS/Desktop, so that they don't feel the hesitation that it would slow down their PC.
PS: Please feel free to add external links that may be helpful, but as of now I haven't been able to find a proper place that provides some sane discussion of this technical overhead comparison.