How to make animations with java fx without stops or lag - multithreading

Question

I'm developing a system with the JFoenix library, and I'm using some buttons with wave animation. But when I use a button to open a new window, or load a list for example, the animation "stops" briefly while the screen loads, or the list loads. I would like to know how to run the animation before loading the list, or something like that. Do not let the animation crash. I've tried to use Threads to load the list, however, because the function that calls the thread gets inside the click function of the button, the animation locks in the same way.
Another example is when I use a JavaFX transition animation to open a new AnchorPane, while its elements are loading, the animation hangs briefly, and that takes away all the quality of the application
Example, when I click the "add" button shown in the image below, it generates a waveform on the button, then performs a function to open the AnchorPane and a transition function to move the panel to the x = 0 position. And it also carries a simple DropDownList with some elements.
The code executed when the button is clicked:
#FXML
public void btnAddClique(ActionEvent event) {
if (telaAtual != 3) { //caso a tela de cadastro nao esteja aberta
PaneAdd add = new PaneAdd();
FXMLLoader loader = new FXMLLoader(getClass().getResource("PaneAdd.fxml"));
loader.setController(add);
try {
if (paneAtual == 1) {
paneFundo2.getChildren().setAll((Node)loader.load());
paneAtual = 2;
} else {
paneFundo.getChildren().setAll((Node)loader.load());
paneAtual = 1;
}
} catch (IOException e){
System.out.println("Erro ao alterar tela, função 'btnAddClique', classe FXMLDocumentController: " + e.toString());
}
telaAtual = 3;
new Thread(new RunAnimacaoAbertura()).start();
add.init(this.listView);
}
}
After that, it runs the Animation Thread:
public class RunAnimacaoAbertura implements Runnable {
public void run() {
TranslateTransition tran = new TranslateTransition();
TranslateTransition tran2 = new TranslateTransition();
tran.setDuration(Duration.seconds(0.250));
tran2.setDuration(Duration.seconds(0.250));
tran.setNode(paneFundo);
tran2.setNode(paneFundo2);
if (paneAtual == 1) {
tran2.setFromX(0);
tran2.setToX(515);
tran.setFromX(-515);
tran.setToX(0);
} else {
tran.setFromX(0);
tran.setToX(515);
tran2.setFromX(-515);
tran2.setToX(0);
}
tran2.play();
tran.play();
}
}
And finally, it performs the function of loading the list:
public void init(JFXListView<Label> listView) {
listViewControler = listView;
cbGerentePA.setItems(arquivo.pegarListaString(1, 0));
date.setPromptText("Nascimento");
date.setEditable(false);
date.setDefaultColor(Color.web("#1abc9c"));
date.getStylesheets().add("agenda/style.css");
hBoxFundoDate.getChildren().setAll(date);
}