&gt; I would think it&#x27;s ridiculous to expect a thread to be able to grab 100% of the GPU, personally.<p>Folks that spend big bucks on dedicated hardware might disagree.<p>&gt; If a game isn&#x27;t fullscreen, I&#x27;m not prioritizing its framerate; it should (be forced to) play nice with my desktop.<p>That&#x27;s fair.  That was also Microsoft&#x27;s reason for not implementing WebGL for a long time, IIRC.  &quot;DoS.&quot;  Thing is, either you want a thread to take everything (like when you play a game fullscreen), or you can just close a demanding application (or tab on a site with misbehaving&#x2F;straining WebGL).