Update of UI is too slow

[njss]

Can you help me figure out, why is the update too slow when I use it to plot an heatmap of the current eye gaze? (real time data from eye-tracker)

I call the heatmap addevent method inside of eyegazeupdate (which is super fast in updating the UI):

onGazeUpdate{
Platform.runLater(() -> {
heatmap.addevent(...);
}
}

thank you in advance!

[njss]

Is this something related to:

http://stackoverflow.com/questions/29260147/javafx-pixelwriter-low-performance