Make UpdateInterval configurable via NohBoard.json

NohBoard/Extra/GlobalSettings.cs

@@ -30,6 +30,11 @@ namespace ThoNohT.NohBoard.Extra
     [DataContract(Name = "GlobalSettings", Namespace = "")]
     public partial class GlobalSettings
     {
+        /// <summary>
+        /// Field for <see cref="UpdateInterval"/>.
+        /// </summary>
+        private int? updateInterval;
+
         /// <summary>
         /// Indicates whether there were changes made to the definition since the last save or load action.
         /// Changes are tracked when undo history is pushed, and reset when a keyboard is loaded or saved.
@@ -106,6 +111,17 @@ public partial class GlobalSettings
         [DataMember]
         public int PressHold { get; set; }
 
+        /// <summary>
+        /// The time in milliseconds between which the keyboard is updated and rendered again.
+        /// Minimum: 5ms (200fps), maximum: 60s, default: 33ms (30fps).
+        /// </summary>
+        [DataMember]
+        public int UpdateInterval
+        {
+            get => this.updateInterval ?? 33;
+            set => this.updateInterval = Math.Max(5, Math.Min(60000, value));
+        }
+
         #endregion Input
 
         #region Trapping

NohBoard/Forms/MainForm.cs

@@ -412,6 +412,7 @@ private void MainForm_Load(object sender, EventArgs e)
                     HookManager.EnableKeyboardHook();
             }
 
+            this.UpdateTimer.Interval = GlobalSettings.Settings.UpdateInterval;
             this.UpdateTimer.Enabled = true;
             this.KeyCheckTimer.Enabled = true;