1. A system for facilitating digital tag prefetching, the system comprising: a computer system comprising physical computer hardware configured to: generate a first tag for a first content page of a content site, the first tag comprising first instructions that, when executed by a user system, cause the user system to determine whether to prefetch a second tag so that the second tag is: cached in memory of the user system prior to loading a second content page of the content site in the memory, and executed with respect to the second content page and not with respect to the first content page, wherein the second tag comprises second instructions that, when executed by the user system, cause the user system to gather data indicative of user interactions with the content site and transmit the gathered data via a computer network, wherein the first and second content pages each comprises page elements that are caused to be rendered for display on a screen of the user system when the first and second content pages are loaded in the memory; and transmit the first tag to the user system so that the user system executes the first tag, wherein the first instructions, when executed by the user system, cause the user system to determine whether to prefetch the second tag so that, in response to loading the second content page in the memory in place of the first content page, the second tag is executed with respect to the second content page.