diff --git a/croppa/main.py b/croppa/main.py
index 424247f..ee5fd04 100644
--- a/croppa/main.py
+++ b/croppa/main.py
@@ -459,8 +459,8 @@ class ProjectView:
 class VideoEditor:
     # Configuration constants
     BASE_FRAME_DELAY_MS = 1  # ~60 FPS
-    SPEED_INCREMENT = 0.2
-    MIN_PLAYBACK_SPEED = 0.1
+    SPEED_INCREMENT = 0.1
+    MIN_PLAYBACK_SPEED = 0.05
     MAX_PLAYBACK_SPEED = 10.0
 
     # Seek multiplier configuration
@@ -983,8 +983,19 @@ class VideoEditor:
 
     def calculate_frame_delay(self) -> int:
         """Calculate frame delay in milliseconds based on playback speed"""
-        delay_ms = int(self.BASE_FRAME_DELAY_MS / self.playback_speed)
-        return max(1, delay_ms)
+        # Round to 2 decimals to handle floating point precision issues
+        speed = round(self.playback_speed, 2)
+        print(f"Playback speed: {speed}")
+        if speed >= 1.0:
+            # Speed >= 1: maximum FPS (no delay)
+            return 1
+        else:
+            # Speed < 1: scale FPS based on speed
+            # At 0.05 speed = 3 FPS, at 1.0 speed = 60 FPS
+            # Formula: fps = 60 * speed, so delay = 1000 / fps
+            target_fps = 80 * speed
+            delay_ms = int(1000 / target_fps)
+            return max(1, delay_ms)
 
     def seek_video(self, frames_delta: int):
         """Seek video by specified number of frames"""
@@ -1166,9 +1177,8 @@ class VideoEditor:
         if not self.is_playing:
             return True
 
-        # Calculate how many frames to advance based on speed
-        frames_to_advance = max(1, int(self.playback_speed))
-        new_frame = self.current_frame + frames_to_advance
+        # Always advance by 1 frame - speed is controlled by delay timing
+        new_frame = self.current_frame + 1
 
         # Handle marker looping bounds
         if self.looping_between_markers and self.cut_start_frame is not None and self.cut_end_frame is not None:
@@ -3045,10 +3055,15 @@ class VideoEditor:
                 # Use calculated frame delay for proper playback speed
                 delay_ms = self.calculate_frame_delay()
             else:
-                # Use minimal delay when not playing for responsive UI
-                delay_ms = 1
+                # Use non-blocking wait for immediate responsiveness when not playing
+                delay_ms = 0
             
+            # Auto advance frame when playing (videos only)
+            if self.is_playing and not self.is_image_mode:
+                self.advance_frame()
+
             # Key capture with appropriate delay
+            print(f"Delay ms: {delay_ms}")
             key = cv2.waitKey(delay_ms) & 0xFF
 
             # Route keys based on window focus
@@ -3302,10 +3317,6 @@ class VideoEditor:
                 print(f"Contracted crop from left by {self.crop_size_step}px")
 
 
-            # Auto advance frame when playing (videos only)
-            if self.is_playing and not self.is_image_mode:
-                self.advance_frame()
-
         self.save_state()
         self.cleanup_render_thread()
         if hasattr(self, 'cap') and self.cap: