Add this to HelloTableView.Java:

        tableView.setOnMouseReleased(new EventHandler<MouseEvent>() {
            public void handle(MouseEvent t) {
                if (t.getClickCount() == 3) {
                    System.out.println("resetting data...");
                    long t0 = System.currentTimeMillis();
                    ObservableList<List<Double>> empty = FXCollections.observableArrayList();
                    tableView.setItems(empty);
                    bigData.clear();
                    getLines(bigData);
                    tableView.setItems(bigData);
                    long t1 = System.currentTimeMillis();
                    System.out.println("Done: " + (t1 - t0));
                }
            }
        });

The code attempts to set empty items into the table then set new items to avoid the code of updating each item in place (whether there is a cost here or not is not the issue).

0) Run HelloTableView
1) Click on 'Performance Test'
2) Triple click on a table item
3) Triple click on a table item again
4) Triple click on a table item once more
5) Setting the table contents gets slower each time

Here is the output:

resetting data...
Done: 12
resetting data...
Done: 2682
resetting data...
Done: 5211