FULL PRODUCT VERSION :
java version "1.8.0_60"
Java(TM) SE Runtime Environment (build 1.8.0_60-b27)
Java HotSpot(TM) 64-Bit Server VM (build 25.60-b23, mixed mode)

ADDITIONAL OS VERSION INFORMATION :
Windows 7 Enterprise SP1
ver: Microsoft Windows [Version 6.1.7601]

A DESCRIPTION OF THE PROBLEM :
In our application we manage the different views by removing/adding them from/to scene graph dynamically. Some of the views contain the TableViews with non-trivial number of columns (50+). We noticed, that call node.getChildren().add(view) for such views takes 5+ seconds. Since this happens in javafx thread, this makes the whole application freeze for this duration.

I managed to extract a self containing test case demonstrating the issue. Just keep clicking on the + button to remove/add the TableView with 288 columns. Adding the TableView takes 3 seconds on a modern Intel Core i7 processor.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
1) Start the test case
2) click + to hide the TableView
3) click + to show the TableView, timing information appear in stdout
repeat steps 2-3 if you like

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Nearly-instanteous appearance of TableView in the scenegraph, no freezing of the application
ACTUAL -
Application freeze for few seconds during addition

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
import java.util.Arrays;

import javafx.application.Application;
import javafx.beans.property.SimpleStringProperty;
import javafx.collections.FXCollections;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.TableColumn;
import javafx.scene.control.TableView;
import javafx.scene.control.cell.PropertyValueFactory;
import javafx.scene.layout.AnchorPane;
import javafx.scene.layout.HBox;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;

public class FXTableViewExample extends Application {
    
    public static class Book {

        private SimpleStringProperty title;
        private SimpleStringProperty author;

        public Book() {
        }

        public Book(String s1, String s2) {
            title = new SimpleStringProperty(s1);
            author = new SimpleStringProperty(s2);
        }

        public String getTitle() {
            return title.get();
        }

        public void setTitle(String s) {
            title.set(s);
        }

        public String getAuthor() {
            return author.get();
        }

        public void setAuthor(String s) {
            author.set(s);
        }

    }

    public static void main(String [] args) {
        Application.launch(args);
    }

    @Override
    public void start(Stage primaryStage) {

        primaryStage.setTitle("Table View Example 1");

        // Books label
        Button showhide = new Button("+");
        HBox hb = new HBox();
        hb.setAlignment(Pos.CENTER);
        hb.getChildren().add(showhide);

        // Table view, data, columns and properties
        TableView<Book> table = new TableView<>();
        table.setItems(FXCollections.observableList(Arrays.asList(new Book("A", "B"))));

        String[] columns = {
            "title", "author", "title", "author", "title", "author", "title", "author", "title", "author", "title", "author", "title", "author", "title", "author", "title", "author", "title", "author", "title", "author", "title", "author"
            , "title", "author", "title", "author", "title", "author", "title", "author", "title", "author", "title", "author", "title", "author", "title", "author", "title", "author", "title", "author", "title", "author", "title", "author"
            , "title", "author", "title", "author", "title", "author", "title", "author", "title", "author", "title", "author", "title", "author", "title", "author", "title", "author", "title", "author", "title", "author", "title", "author"
            , "title", "author", "title", "author", "title", "author", "title", "author", "title", "author", "title", "author", "title", "author", "title", "author", "title", "author", "title", "author", "title", "author", "title", "author"
            , "title", "author", "title", "author", "title", "author", "title", "author", "title", "author", "title", "author", "title", "author", "title", "author", "title", "author", "title", "author", "title", "author", "title", "author"
            , "title", "author", "title", "author", "title", "author", "title", "author", "title", "author", "title", "author", "title", "author", "title", "author", "title", "author", "title", "author", "title", "author", "title", "author"
            , "title", "author", "title", "author", "title", "author", "title", "author", "title", "author", "title", "author", "title", "author", "title", "author", "title", "author", "title", "author", "title", "author", "title", "author"
            , "title", "author", "title", "author", "title", "author", "title", "author", "title", "author", "title", "author", "title", "author", "title", "author", "title", "author", "title", "author", "title", "author", "title", "author"
            , "title", "author", "title", "author", "title", "author", "title", "author", "title", "author", "title", "author", "title", "author", "title", "author", "title", "author", "title", "author", "title", "author", "title", "author"
            , "title", "author", "title", "author", "title", "author", "title", "author", "title", "author", "title", "author", "title", "author", "title", "author", "title", "author", "title", "author", "title", "author", "title", "author"
            , "title", "author", "title", "author", "title", "author", "title", "author", "title", "author", "title", "author", "title", "author", "title", "author", "title", "author", "title", "author", "title", "author", "title", "author"
            , "title", "author", "title", "author", "title", "author", "title", "author", "title", "author", "title", "author", "title", "author", "title", "author", "title", "author", "title", "author", "title", "author", "title", "author"
        };
        for (String prop : columns) {
            TableColumn<Book, String> col = new TableColumn<>(prop);
            col.setCellValueFactory(new PropertyValueFactory<>(prop));
            table.getColumns().add(col);
        }
        table.setColumnResizePolicy(TableView.UNCONSTRAINED_RESIZE_POLICY);
        
        AnchorPane tmp = new AnchorPane(table);
        for (int i=0; i<50; i++) {
            tmp = new AnchorPane(tmp);
            AnchorPane.setTopAnchor(tmp, 0.0);
            AnchorPane.setRightAnchor(tmp, 0.0);
            AnchorPane.setBottomAnchor(tmp, 0.0);
            AnchorPane.setLeftAnchor(tmp, 0.0);
        }
        final AnchorPane paneForTable = tmp;

        final VBox vbox = new VBox(20);
        vbox.getChildren().addAll(hb, paneForTable);
        
        showhide.setOnAction((event) -> {
            if (!vbox.getChildren().remove(paneForTable)) {
                long started = System.currentTimeMillis();
                vbox.getChildren().add(paneForTable);
                long duration = System.currentTimeMillis() - started;
                System.out.println(String.format("Add took %d ms for %d columns", duration, table.getColumns().size()));
            }
        });

        // Scene
        Scene scene = new Scene(vbox, 500, 475);
        primaryStage.setScene(scene);
        primaryStage.show();
    }
}

---------- END SOURCE ----------