Systems, methods, and devices are provided for optimizing streaming bitrate in response to variations in processor load. In various embodiments, a streaming media server includes a processor and a computer-readable storage medium, which stores computer-readable code or instructions. When executed by the processor, the computer-readable code causes the server to encode segments of a video stream at a final variable bitrate (ABRFINAL). The encoded segments are transmitted from the server, over a network, and to a first client media receiver for presentation to an end user. The steps of encoding and transmitting are repeated during a streaming video session with the first client media receiver, while varying a value of ABRFINAL based, at least in part, upon a running average of a processor load placed on the processor (LOADAVG).