Techniques and systems are disclosed for managing computer resources available to multiple running instances of a media player program. The methods include monitoring consumption of computing resources of multiple running instances of a media player program to render respective media content in a graphical user interface of a computing device. The graphical user interface associated with an additional program configured to render additional content, different from the media content, to the graphical user interface. The additional program can be a browser. The methods further include instructing the multiple instances to reduce respective portions of the computing resources consumption upon determining that a requested increase in computer resources consumption of the media player program would cause the computer resources consumption of the media player program to exceed a first predetermined level.