Abstract: Mediation data may be prefetched to reduce latency associated with presentation of digital media. Prior to the selection of online content associated with presentation of digital media in a media space, a mediation process may be initiated. Initiating the mediation process may include prefetching mediation data from a remote server, wherein the mediation data includes a media tag corresponding to a particular media item and valuation data indicative of a value of presenting the particular media item in the media space. After the selection of the online content, the mediation process may be completed. Completing the mediation process may include sending the mediation data to a remote allocation manager, and receiving allocation data indicative of a digital media item to be presented in the media space. Subsequent to the completion of the mediation process, the digital media item identified by the allocation data may be presented in the media space.