How to get rid of the "not responding" when working JavaFX application?

Good time of day. When the application window shows "not responding", although the app itself is quite normally works. But no visible progress (track via progress bars) due to the fact that the window is not updated. I tried to call requestLayout method the container (in my case AnchorPane). No visible result is not given...

Link to the repository: https://github.com/g0rd1/search-people

In the UpdateData method src.main.java.control.Controller.java
June 8th 19 at 16:25

Find more questions by tags JavaJavaFX