t priority
 <pre> &lt;nice newPriority="10" &gt;</pre><p>
 Raise the priority of the build process (But not forked programs)
 <pre> &lt;nice currentPriority="old" newPriority="3" &gt;</pre><p>
 Lower the priority of the build process (But not forked programs), and save
 the old value to the property <code>old</code>.</div>
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