1. A computer-implemented method of improving rendering performance of complex web pages with four or more iFrames, including: evaluating function libraries for rendering a complex web page including four or more distinct iFrames and that are used within the four or more distinct iFrames on the complex web page; identifying, from the evaluated function libraries, sets of identical redirectable function libraries that are referenced in multiple distinct instances within at least two iFrames of the four or more distinct iFrames; mapping a redirection of an identified set of identical redirectable function libraries to a single canonical function library, whereby loading the complex web page includes loading the single canonical function library instead of loading the multiple distinct instances of the identical redirectable function libraries of the identified set in the at least two iFrames of the four or more distinct iFrames; modifying references to the identified set of the identical redirectable function libraries on the complex web page, wherein the modifying includes prefixing the references to the identical redirectable function libraries of the identified set with a count of a literal “parent.” or a literal “top.” or a reference derived from a “parent.” or “top.” function, in place of a longer URL location of a distinct instance of a function library of the identified set, that redirects the references to the identical redirectable function libraries to a bridging level HTML parent web page; and providing, on the bridging level HTML parent web page, a reference to the single canonical function library.