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Finished in 10.26 seconds</code></pre><p>The renderer is very simple and can be ruined by any other output, your program produce during the loop:</p>
<pre><code class='lisp'>POFTHEDAY&gt; (cl-progress-bar:with-progress-bar
                 (100 &quot;Testing the progressbar&quot;)
               (loop for i from 1 upto 100
                     do (cl-progress-bar:update 1)
                        (when (zerop (mod i 10))
                          (format t &quot;This is ~A-th iterat