ing is enabled).</p>
<p>You can further increase performance by reducing lock contention with the <a href="http://goog-perftools.sourceforge.net/doc/tcmalloc.html">tcmalloc</a> memory allocation library.  To enable, add <samp>--with-tcmalloc</samp> to the <samp>configure</samp> command-line when you build ImageMagick.</p>
<h4>The Perils of Parallel Execution</h4>
<p>It can be difficult to predict behavior in a parallel environment. Performance might depend on a number of factors including the compiler, the 