Systems and techniques for prefetching data

A system comprising:

• a client device comprising a data processing apparatus programmed to perform operations for reducing digital media latency, the operations comprising:
• determining a likelihood of a user activity triggering presentation of a digital media item by the client device in a media space associated with a digital document, wherein the determining of the likelihood is based on an estimate of an amount of time that will elapse before the digital media item is accessible in the media space in accordance with a distance between a displayed portion of the media space and the digital media item;
• determining that the likelihood exceeds a threshold and, based thereon, prior to the user activity triggering the presentation of the digital media item, initiating a mediation process for identifying the digital media item to be presented in the media space, wherein initiating the mediation process includes prefetching mediation data from a remote server, and wherein the mediation data includes a media tag corresponding to the digital media item and valuation data indicative of a value of presenting the digital media item in the media space;
• subsequent to the user activity triggering the presentation of the digital media item, completing the mediation process, wherein completing the mediation process comprises:
• sending the mediation data to a remote allocation manager, and
• in response to sending the mediation data, receiving, from the remote allocation manager, allocation data indicative of the digital media item to be presented in the media space;
• and
• subsequent to completing the mediation process, presenting the digital media item identified by the allocation data in the media space on the client device.

A non-transitory computer storage medium having instructions stored thereon that, when executed by a data processing apparatus of a client device, cause the data processing apparatus to perform operations for reducing digital media latency, the operations comprising:

• determining a likelihood of an activity triggering presentation of a digital media item by the client device in a media space associated with a digital document, wherein the determining of the likelihood is based on an estimate of an amount of time that will elapse before the digital media item is accessible in the media space in accordance with a distance between a displayed portion of the media space and the digital media item;
• determining that the likelihood exceeds a threshold and, based thereon, prior to the activity triggering the presentation of the digital media, initiating a mediation process for identifying the digital media to be presented in the media space, wherein initiating the mediation process includes prefetching mediation data from a remote server, and wherein the mediation data includes a media tag corresponding to the digital media item and valuation data indicative of a value of presenting the digital media item in the media space;
• subsequent to the activity triggering the presentation of the digital media item, completing the mediation process, wherein completing the mediation process comprises:
• sending the mediation data to a remote allocation manager, and
• in response to sending the mediation data, receiving, from the remote allocation manager, allocation data indicative of the digital media item to be presented in the media space;
• and
• subsequent to completing the mediation process, presenting the digital media item identified by the allocation data in the media space on the client device.