1. A computer readable memory storing computer-executable instructions that, when executed, cause one or more processors to perform acts that generate a parental dependency graph that captures relationships between web objects in a webpage, the acts comprising: extracting a list of the web objects that are in the webpage; determining that a first web object in the list is a descendant object of a second web object in the list at least when a delay in downloading of the second web object during a download of the webpage causes a corresponding delay in downloading of the first web object; and generating the parental dependency graph that captures a dependency relationship indicating that the first web object is the descendant object of the second object, the parental dependency graph to enable an estimation of a page load time for the webpage based at least on adjusting load timing information of one or more web objects included in the parental dependency graph.