1. A system comprising: a computer-readable memory storing executable instructions; and one or more processors in communication with the computer-readable memory, wherein the one or more processors are programmed by the executable instructions to at least: obtain, from a remote device, audio data regarding an utterance of a user, the utterance comprising a plurality of words; determine a likely word boundary in the audio data; generate first incremental speech recognition results from a first portion of the audio data, the first portion comprising only audio data preceding the likely word boundary; generate a first semantic representation of the utterance using the first incremental speech recognition results and without using incremental speech recognition results representing any portion of the audio data following the likely word boundary; generate a first stability score indicating a degree to which the first semantic representation of the utterance is the same as a previously-generated semantic representation of the utterance; determine that the first stability score satisfies a first threshold; in response to determining that the first stability score satisfies the first threshold: determine a plurality of content items associated with the first intent; and initiate loading of the plurality of content items; generate second incremental speech recognition results from the first portion and a second portion of the audio data, the second portion comprising audio data preceding the likely word boundary and audio data subsequent to the likely word boundary; generate a second semantic representation of the utterance using the second incremental speech recognition results; generate a second stability score indicating a degree to which the first semantic representation of the utterance is the same as the second semantic representation of the utterance; determine that the second stability score satisfies a second threshold; and in response to determining that the second stability score satisfies the second threshold: determine a requested content item of the plurality of content items based at least partly on the second semantic representation; and cause presentation of the requested content item by the remote device.