title: Color change of GUI button in custom Unity Editor is significantly delayed
body: <p>When I try to make a GUI button in the Unity Editor change colors on hover, the color change is successful but horribly delayed. Here is a gif of the button's activity when the mouse hovers over it:</p>
  <p><a href="https://i.stack.imgur.com/HUrAn.gif" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/HUrAn.gif" alt="gif of the button changing color slowly when hovered" /></a></p>
  <p>As you can see, the color change is considerably delayed.  I need to find a way to speed this up to where the button changes color as soon as the mouse hits it</p>
  <p>Here's the minimum code needed to reproduce the example.  First, the empty class used to create the editor:</p>
  <pre><code>using UnityEngine;
  public class Test : MonoBehaviour
  {
     
  }
  </code></pre>
  <p>Then, the custom editor used to create the button:</p>
  <pre><code>using UnityEngine;
  using UnityEditor;
  
  [CustomEditor(typeof(Test))]
  public class TestEditor : Editor
  {
      public override void OnInspectorGUI()
      {
          base.OnInspectorGUI();
  
          GUIStyle style = new GUIStyle()
          {
              alignment = TextAnchor.MiddleCenter,
              fontStyle = FontStyle.Bold,
  
              normal = new GUIStyleState()
              {
                  background = Texture2D.whiteTexture
              },
              hover = new GUIStyleState()
              {
                  background = Texture2D.grayTexture
              },
              active = new GUIStyleState()
              {
                  background = Texture2D.blackTexture
              }
          };
  
          GUILayout.Button(&quot;Hello!&quot;, style);
      }
  }
  </code></pre>
  <p>If you attach this emtpy &quot;Test&quot; class to a GameObject in the Unity scene, you should get the editor pictured at the top of the post.</p>
  <p>Is there some workaround to make this color change faster and more responsive?  Any advice is greatly appreciated!</p>