1. In a packet processing engine of a device, the packet processing engine processing a network packet comprising at least one dynamically generated object and storing the at least one dynamically generated object in a cache, a method for invalidating a cached dynamically generated object in the cache responsive to a signal of a packet processing timer, the method comprising the steps of: (a) receiving, by a packet processing engine of a device, a first signal from a packet processing timer directing the packet processing engine to process an incoming network packet, the first signal providing a time for expiration of a cached dynamically generated object of less than or equal to a duration of time to dynamically generate and serve the dynamically generated object from an originating server; (b) processing, by the packet processing engine, the incoming network packet responsive to the first signal; and (c) transmitting, by the packet processing engine responsive to the first signal, a second signal to a cache indicating a cached dynamically generated object is invalid.