ayer#rerender (method)">#rerender</a></span>.</p>

<p>In contrast, <span class='object_link'><a href="ActiveLayer.html" title="Zif::Layers::ActiveLayer (class)">ActiveLayer</a></span> is built on <span class='object_link'><a href="../CompoundSprite.html" title="Zif::CompoundSprite (class)">CompoundSprite</a></span> and therefore must rerender every sprite on every tick.  This is balanced by not incurring a performance / memory penalty by rendering a sprite the size of the entire <span class='object_link'><a