How to know what is slowing down my drupal site My site is still in early stages of development and the page load is getting slower day by day. Even though i really think twice before installing a module for something and try to get it done with jQuery. 

Is there a way to know "What Exactly (A module or my theme templates) is slowing down the site ?".

thanks
you can install devel module and enable show queries so you can look at what queries run your website.Find out havy query and try to optimize.