adapt frame rate based on whether events are happening

Program.cs

@@ -418,14 +418,27 @@ public class Game : GameWindow {
   Shader shader = new();
   Matrix4 projection;
   float zoomLevel = 0f;
+  double timeSinceEvent = 0;
 
   protected override void OnUpdateFrame(FrameEventArgs e) {
     base.OnUpdateFrame(e);
     toast.Update(e.Time);
 
-    Photo previousPhoto = photos[photoIndex];
-
     KeyboardState input = KeyboardState;
+    if (input.IsAnyKeyDown || MouseState.IsAnyButtonDown || MouseState.Delta != Vector2i.Zero) {
+      timeSinceEvent = 0;
+    } else {
+      timeSinceEvent += e.Time;
+    }
+    if (IsFocused && timeSinceEvent < 1) {
+      RenderFrequency = 30;
+      UpdateFrequency = 30;
+    } else {
+      RenderFrequency = 2;
+      UpdateFrequency = 2;
+    }
+
+    Photo previousPhoto = photos[photoIndex];
 
     bool shiftIsDown = input.IsKeyDown(Keys.LeftShift) || input.IsKeyDown(Keys.RightShift);
     bool altIsDown = input.IsKeyDown(Keys.LeftAlt) || input.IsKeyDown(Keys.RightAlt);
@@ -664,8 +677,8 @@ public class Game : GameWindow {
     // string[] files = Directory.GetFiles(@"c:\users\colin\desktop\totte-output\2023\07\31");
     // string[] files = Directory.GetFiles(@"c:\users\colin\desktop\import");
     // string[] files = Directory.GetFiles(@"C:\Users\colin\Pictures\photos\2018\06\23");
-    string[] files = Directory.GetFiles(@"C:\Users\colin\Desktop\Germany all\104D7000");
-    // string[] files = Directory.GetFiles(@"C:\Users\colin\Desktop\many-birds\");
+    // string[] files = Directory.GetFiles(@"C:\Users\colin\Desktop\Germany all\104D7000");
+    string[] files = Directory.GetFiles(@"C:\Users\colin\Desktop\many-birds\");
 
     for (int i = 0; i < files.Count(); i++) {
       string file = files[i];