CODEWITHSUNDEEP
performancechartsjavafx-8
Stefan Endrullis
Stefan Endrullis

Reputation: 4208

How to improve JavaFX chart performance?

I want to visualize a static chart with 10 series each having 10'000 points using JavaFX. After my first tests I'm a bit worried about the performance of the JavaFX chart API, especially about the constructor new XYChart.Series<>(...) which takes 3 minutes of initialization for 100'000 data points.

If you don't believe me, run the code below:

public static final int SIZE = 100000;

public static void main(String[] args) {
    List<XYChart.Data<Integer, Integer>> data = new ArrayList<>(SIZE);

    measureTime("creating list", () -> {
        for (int i=0; i<SIZE; i++) {
            data.add(new XYChart.Data<>(i, i));
        }
    });

    measureTime("creating series", () -> {
        new XYChart.Series<>(FXCollections.observableList(data));
    });
}

public static void measureTime(String msg, Runnable f) {
    long start = System.nanoTime();
    f.run();
    long end = System.nanoTime();

    System.err.println("Time for " + msg + ": " + (end - start) / 1000000 + " ms");
}

These are the results on my computer:

Time for creating list: 62 ms
Time for creating series: 173555 ms

Why does this initialization take so long and how can one work around this?

Or is there a way to use the JavaFX charts without Observables?

Upvotes: 4

Views: 2359

Answers (1)

jewelsea
jewelsea

Reputation: 159341

It looks like series creation was a performance issue which was fixed between Java 8u25 and Java 8u40.

I ran your application on 8u25 and got the following result:

Time for creating list: 59 ms 
Time for creating series: 135896 ms

Upgrading to 8u40 and running again, I got the following result:

Time for creating list: 66 ms
Time for creating series: 80 ms

So, just update to the latest Java version and you should be good to go.

Upvotes: 4

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