Update randomness.html

Author: Bram Vanroy

docs/stable/notes/randomness.html

@@ -301,7 +301,7 @@ <h2>CuDNN<a class="headerlink" href="#cudnn" title="Permalink to this headline">
 </div>
 <div class="admonition warning">
 <p class="admonition-title">Warning</p>
-<p>Deterministic mode can have a performance impact, depending on your model.</p>
+<p>Deterministic mode can have a performance impact, depending on your model. This means that due to the deterministic nature of the model, the processing speed (i.e. processed batch items per second) can be lower than when the model is non-deterministic.</p>
 </div>
 </div>
 <div class="section" id="numpy">
@@ -581,4 +581,4 @@ <h2>Resources</h2>
     })
   </script>
 </body>
-</html>
+</html>