How Object repository works and how is it faster?

How Object repository works and how is it faster?

References

Reference NO 1

http://stackoverflow.com/questions/15193536/how-object-repository-works-and-how-is-it-faster

Reference NO 2

http://testingideas.wordpress.com/2008/08/26/object-repository-and-descriptive-programming-in-qtp/

Reference NO 3

http://relevantcodes.com/dp-vs-or/

Reference NO 4

http://qtp.blogspot.com/2008/07/object-repository-vs-descriptive.html

Reference NO 5

http://www.sliglobalsolutions.com/files/download/3

Reference NO 6

http://www.articlesontesting.com/2011/02/descriptive-programming-versus-object.html

Reference NO 7

http://sqa.stackexchange.com/questions/2693/maintaining-qtp-object-repository-best-practice-for-a-multideveloper-environmen

Reference NO 8

https://www.kernel.org/pub/software/scm/git/docs/user-manual.html