Accessing to apur1e.wordpress.com via Firefox with Tools>Web Developer >Network shows many GET and POST methods are executed to access to the blog home page.
While accessing to apurie.com via Firefox with Tools>Web Developer>Network shows single methods is executed to go to my static home page without images and CSS file.
The above is an apples and oranges comparison.
But one can sense wordpress.com has possibly includes overhead due to database accesses, theme effectiveness, and additional advertisement images and gifs.
For future, I would like to compare the WordPress on my Bluehost installation to compare with free WordPress.com site.