diff --git a/src/patterns/bar_graph.py b/src/patterns/bar_graph.py
index 72738d2..bb6db52 100644
--- a/src/patterns/bar_graph.py
+++ b/src/patterns/bar_graph.py
@@ -7,15 +7,23 @@ class BarGraph:
 
     def run(self, preset):
         colors = preset.c if preset.c else [(0, 255, 0), (255, 80, 0)]
-        level = max(0, min(100, int(preset.n1) if int(preset.n1) >= 0 else 50))
-        target = (self.driver.num_leds * level) // 100
-        lit = self.driver.apply_brightness(colors[0], preset.b)
-        unlit = self.driver.apply_brightness(colors[1] if len(colors) > 1 else (0, 0, 0), preset.b)
+        last_update = utime.ticks_ms()
         while True:
-            for i in range(self.driver.num_leds):
-                self.driver.n[i] = lit if i < target else unlit
-            self.driver.n.write()
+            delay_ms = max(1, int(preset.d))
+            now = utime.ticks_ms()
+            if utime.ticks_diff(now, last_update) >= delay_ms:
+                level = max(0, min(100, int(preset.n1) if int(preset.n1) >= 0 else 50))
+                target = (self.driver.num_leds * level) // 100
+                lit = self.driver.apply_brightness(colors[0], preset.b)
+                unlit = self.driver.apply_brightness(
+                    colors[1] if len(colors) > 1 else (0, 0, 0),
+                    preset.b,
+                )
+                for i in range(self.driver.num_leds):
+                    self.driver.n[i] = lit if i < target else unlit
+                self.driver.n.write()
+                last_update = utime.ticks_add(last_update, delay_ms)
+                if not preset.a:
+                    yield
+                    return
             yield
-            if not preset.a:
-                return
-            utime.sleep_ms(max(1, int(preset.d)))
diff --git a/src/patterns/heartbeat.py b/src/patterns/heartbeat.py
index 37b4819..c14b4e4 100644
--- a/src/patterns/heartbeat.py
+++ b/src/patterns/heartbeat.py
@@ -7,19 +7,24 @@ class Heartbeat:
 
     def run(self, preset):
         colors = preset.c if preset.c else [(255, 0, 40)]
-        p1 = max(20, int(preset.n1) if int(preset.n1) > 0 else 120)
-        p2 = max(20, int(preset.n2) if int(preset.n2) > 0 else 80)
-        pause = max(20, int(preset.n3) if int(preset.n3) > 0 else 500)
+        phase = 0
+        phase_start = utime.ticks_ms()
+        lit_color = self.driver.apply_brightness(colors[0], preset.b)
         while True:
-            c = self.driver.apply_brightness(colors[0], preset.b)
-            self.driver.fill(c)
-            utime.sleep_ms(p1)
-            self.driver.fill((0, 0, 0))
-            utime.sleep_ms(max(20, int(preset.d)))
-            self.driver.fill(c)
-            utime.sleep_ms(p2)
-            self.driver.fill((0, 0, 0))
-            utime.sleep_ms(pause)
+            p1 = max(20, int(preset.n1) if int(preset.n1) > 0 else 120)
+            p2 = max(20, int(preset.n2) if int(preset.n2) > 0 else 80)
+            pause = max(20, int(preset.n3) if int(preset.n3) > 0 else 500)
+            beat_gap = max(20, int(preset.d))
+            lit_color = self.driver.apply_brightness(colors[0], preset.b)
+            phase_durations = (p1, beat_gap, p2, pause)
+            phase_colors = (lit_color, (0, 0, 0), lit_color, (0, 0, 0))
+
+            now = utime.ticks_ms()
+            if utime.ticks_diff(now, phase_start) >= phase_durations[phase]:
+                phase = (phase + 1) % 4
+                phase_start = utime.ticks_add(phase_start, phase_durations[(phase - 1) % 4])
+
+            self.driver.fill(phase_colors[phase])
             yield
-            if not preset.a:
+            if not preset.a and phase == 0:
                 return
diff --git a/src/patterns/palette_morph.py b/src/patterns/palette_morph.py
index 72ccd91..27fb35f 100644
--- a/src/patterns/palette_morph.py
+++ b/src/patterns/palette_morph.py
@@ -34,9 +34,15 @@ class PaletteMorph:
         base_idx = 0
         start = utime.ticks_ms()
         phase = self.driver.step % 256
+        last_update = start
 
         while True:
             now = utime.ticks_ms()
+            delay_ms = max(1, int(preset.d))
+            if utime.ticks_diff(now, last_update) < delay_ms:
+                yield
+                continue
+            last_update = utime.ticks_add(last_update, delay_ms)
             age = utime.ticks_diff(now, start)
             if age < morph:
                 t = (age * 255) // morph
@@ -72,5 +78,4 @@ class PaletteMorph:
                     return
             phase = (phase + warp_rate) & 255
             self.driver.step = phase
-            utime.sleep_ms(max(1, int(preset.d)))
             yield
diff --git a/src/patterns/strobe_burst.py b/src/patterns/strobe_burst.py
index 91d57cb..aaafc9c 100644
--- a/src/patterns/strobe_burst.py
+++ b/src/patterns/strobe_burst.py
@@ -7,18 +7,38 @@ class StrobeBurst:
 
     def run(self, preset):
         colors = preset.c if preset.c else [(255, 255, 255)]
-        count = max(1, int(preset.n1) if int(preset.n1) > 0 else 3)
-        gap = max(1, int(preset.n2) if int(preset.n2) > 0 else 60)
-        cooldown = max(1, int(preset.n3) if int(preset.n3) > 0 else 400)
-        c = self.driver.apply_brightness(colors[0], preset.b)
+        state = "flash_on"
+        flash_idx = 0
+        state_start = utime.ticks_ms()
         while True:
-            for _ in range(count):
+            count = max(1, int(preset.n1) if int(preset.n1) > 0 else 3)
+            gap = max(1, int(preset.n2) if int(preset.n2) > 0 else 60)
+            cooldown = max(1, int(preset.n3) if int(preset.n3) > 0 else 400)
+            on_ms = max(1, int(preset.d) // 2)
+            c = self.driver.apply_brightness(colors[0], preset.b)
+            now = utime.ticks_ms()
+
+            if state == "flash_on":
                 self.driver.fill(c)
-                utime.sleep_ms(max(1, int(preset.d)//2))
+                if utime.ticks_diff(now, state_start) >= on_ms:
+                    state = "flash_off"
+                    state_start = utime.ticks_add(state_start, on_ms)
+            elif state == "flash_off":
                 self.driver.fill((0, 0, 0))
-                utime.sleep_ms(gap)
-                yield
-            utime.sleep_ms(cooldown)
+                if utime.ticks_diff(now, state_start) >= gap:
+                    flash_idx += 1
+                    if flash_idx >= count:
+                        if not preset.a:
+                            return
+                        state = "cooldown"
+                        flash_idx = 0
+                        state_start = utime.ticks_add(state_start, gap)
+                    else:
+                        state = "flash_on"
+                        state_start = utime.ticks_add(state_start, gap)
+            else:
+                self.driver.fill((0, 0, 0))
+                if utime.ticks_diff(now, state_start) >= cooldown:
+                    state = "flash_on"
+                    state_start = utime.ticks_add(state_start, cooldown)
             yield
-            if not preset.a:
-                return