Windows form is freezing when trying to update user control-how to fix this?

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C#

forms

We are creating 16 user control on a windows form. The user control has many gif animation get displayed. I am trying to call the user control to update these animation using the below code. guiLogUpdateButton_Click is the button in the windows form. There is a task that will run the testing function after button is pressed. SlotModel is the user control object that contains all information. UpdateView is the function called the view of the user control. And as the animation get updated to the windows form, the windows form get stucked/freezed on the software.

private void guiLogUpdateButton_Click(object sender, EventArgs e)
        {
                            Task b = Task.Run(() =>
                                {
                                    testing();
            });
        }

        private void testing()
        {
                SlotModel[] slotModel = new SlotModel[16];
                for (int slotNumber = 0; slotNumber < 16; slotNumber++)
                {
                    int i = slotNumber;
                    slotModel[i] = new SlotModel(i);
                    Task u = Task.Run(() =>
                    {
                        slotModel[i].status.Clear();
                        slotModel[i].status.Add(enumSlotStatus.Running);
                        UpdateView(slotModel[i]);
                        Thread.Sleep(500);
                        slotModel[i].status.Clear();
                        slotModel[i].status.Add(enumSlotStatus.Pass);
                        UpdateView(slotModel[i]);
                        Thread.Sleep(500);
                        slotModel[i].status.Clear();
                        slotModel[i].status.Add(enumSlotStatus.Fail);
                        UpdateView(slotModel[i]);
                        Thread.Sleep(500);
                    });
                }

        }

//This is the code for the user control below

public void UpdateView(Gen5.Model.SlotModel slotModel)
        {

if (InvokeRequired)
            {
                this.Invoke((MethodInvoker)delegate { UpdateView(slotModel); });
            }
            else
            {
//this is where the user control get updated
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What I have tried:

We try other ways to do it but all of them create the lag on the software.