check => heavy method stops ui

WhoStopsUI.cs

using System.Threading.Tasks;
using UnityEngine;
using UnityEngine.UI;

public class WhoStopsUI : MonoBehaviour
{
    private void Suspect()
    {
        // something heavy...
    }

    #region Detective office

    void Start()
    {
        Investigator();
    }

    [SerializeField] private Text _investigatorText;

    private async Task Investigator()
    {
        while (this.enabled)
        {
            _investigatorText.text = "3";
            await Task.Delay(1000);
            _investigatorText.text = "2";
            await Task.Delay(1000);
            _investigatorText.text = "1";
            await Task.Delay(1000);
            _investigatorText.text = "in";

            await Task.Run(() => Suspect());

            _investigatorText.text = "out";

            await Task.Delay(3000);
        }
    }


    [SerializeField] private Text _counterText;
    private long _counter = 0;

    void FixedUpdate()
    {
        _counter++;
        _counterText.text = _counter.ToString();
    }

    #endregion
}