&gt; Action games may be the minority of all games developed, maybe<p>I specified &quot;fast twitch action&quot;, not just action.   For instance, both of the open-world action games you mentioned are single-player only, so issues like lag and slowdown are less critical.  Also, enemies in those games are almost always slow-moving- definitely no fast-twitch required.<p>For fast twitch <i>action</i> (not shooter), I might include things like street fighter, where button timing and reflexes are critical.  Most 2.5d platformers I&#x27;ve seen would <i>not</i> suffer that much for the occasional dozen-millisecond GC pause.  In fact, many of them have worse pauses than that for less prosaic reasons.  ;-)