diff --git a/examples/opf/clients/hotgym/prediction/one_gym/nupic_output.py b/examples/opf/clients/hotgym/prediction/one_gym/nupic_output.py
index 0f7528f20f..c6ca8665e0 100644
--- a/examples/opf/clients/hotgym/prediction/one_gym/nupic_output.py
+++ b/examples/opf/clients/hotgym/prediction/one_gym/nupic_output.py
@@ -187,6 +187,11 @@ def write(self, timestamps, actualValues, predictedValues,
     plt.legend(('actual','predicted'), loc=3)
 
 
+  def refreshGUI(self):
+      """Give plot a pause, so data is drawn and GUI's event loop can run.
+      """
+      plt.pause(0.0001)
+
 
   def close(self):
     plt.ioff()
diff --git a/examples/opf/clients/hotgym/prediction/one_gym/run.py b/examples/opf/clients/hotgym/prediction/one_gym/run.py
index 8a79d59b1b..f713e15ffe 100755
--- a/examples/opf/clients/hotgym/prediction/one_gym/run.py
+++ b/examples/opf/clients/hotgym/prediction/one_gym/run.py
@@ -127,6 +127,9 @@ def runIoThroughNupic(inputData, model, gymName, plot):
     prediction = result.inferences["multiStepBestPredictions"][1]
     output.write([timestamp], [consumption], [prediction])
 
+    if plot and counter % 20 == 0:
+        output.refreshGUI()
+
   inputFile.close()
   output.close()