diff --git a/firmware/src/audio.h b/firmware/src/audio.h
index 211bebd..2c9b69a 100644
--- a/firmware/src/audio.h
+++ b/firmware/src/audio.h
@@ -6,7 +6,7 @@
 #define AUDIO_PIN 2
 
 #define AUDIO_RATE 44000.0f
-#define BUFFER_LEN 16384
+#define BUFFER_LEN 512*32
 #define BUFFER_LEN_MS (BUFFER_LEN / AUDIO_RATE) * 1000.0f
 
 extern uint8_t wav_buffer_0[BUFFER_LEN];
diff --git a/firmware/src/leds.cpp b/firmware/src/leds.cpp
index 67c23ca..c96aa0d 100644
--- a/firmware/src/leds.cpp
+++ b/firmware/src/leds.cpp
@@ -56,34 +56,26 @@ void leds_init() {
   // clear output - rows
   clearShiftReg(ROW_SRCLK, ROW_SRCLR);
   pulsePin(ROW_RCLK);
-
-  /*
-  // launch core1
-  // NOTE: For some reason, without delay, core1 doesn't start?
-  delay(500);
-  multicore_reset_core1();
-  multicore_launch_core1(main2);
-  */
 }
 
 void leds_disable() {
   outputEnable(ROW_OE, false);
 }
 
-void leds_loop() {
-  // game of life step
-  // auto now = millis();
-  // if (now - frameLastChangedAt > 100) {
-  //   frameLastChangedAt = now;
-  //   life_step();
-  //   for (int y = 0; y < ROW_COUNT; y++) {
-  //     for (int x = 0; x < COL_COUNT; x++) {
-  //       framebuffer[y * ROW_COUNT + x] = cells[y * ROW_COUNT + x] ? 255 : 0;
-  //     }
-  //   }
-  // }
+void main2() {
+  // where we're going, we don't need no interrupts
+  noInterrupts();
+  while (true) {
+    leds_render();
+  }
+}
 
-  leds_render();
+void leds_initRenderer() {
+  // launch core1
+  // NOTE: For some reason, without delay, core1 doesn't start?
+  // delay(500);
+  multicore_reset_core1();
+  multicore_launch_core1(main2);
 }
 
 void leds_render() {
@@ -153,7 +145,7 @@ void leds_render() {
 
     // show for a certain period
     outputEnable(ROW_OE, true);
-    delayMicroseconds(brightnessPhaseDelays[brightnessPhase]);
+    busy_wait_us_32(brightnessPhaseDelays[brightnessPhase]);
     outputEnable(ROW_OE, false);
   }
 
diff --git a/firmware/src/leds.h b/firmware/src/leds.h
index e38955a..6418118 100644
--- a/firmware/src/leds.h
+++ b/firmware/src/leds.h
@@ -23,6 +23,7 @@
 #define MS_PER_FRAME 1000 / FPS
 
 void leds_init();
+void leds_initRenderer();
 void leds_disable();
 void leds_loop();
 void leds_render();
diff --git a/firmware/src/main.cpp b/firmware/src/main.cpp
index 296405e..5fc2e54 100644
--- a/firmware/src/main.cpp
+++ b/firmware/src/main.cpp
@@ -34,10 +34,12 @@ void setup() {
     Serial.println("Failed to load gfx blob");
     while (true) {}
   }
+
+  leds_initRenderer();
 }
 
 void loop() {
-  sd_loadNextAudio();
+  // sd_loadNextAudio();
 
   // if (Serial.available() > 0) {
   //   char c = Serial.read();
@@ -55,6 +57,4 @@ void loop() {
   if (!gfx_decoder_handleLoop()) {
     Serial.println("Failed to load frame...");
   }
-
-  leds_render();
 }
diff --git a/firmware/src/sd.cpp b/firmware/src/sd.cpp
index a32dec9..2612d78 100644
--- a/firmware/src/sd.cpp
+++ b/firmware/src/sd.cpp
@@ -193,6 +193,7 @@ void sd_loadNextAudio() {
   }
   next_buffer_requested = false;
 
+  auto b4 = millis();
   auto next_buffer = wav_buffer1_active ? &wav_buffer_0 : &wav_buffer_1;
   auto bytesRead = audioFile.read(next_buffer, BUFFER_LEN);
 
@@ -202,7 +203,9 @@ void sd_loadNextAudio() {
   } else {
     Serial.print("Read ");
     Serial.print(bytesRead);
-    Serial.println(" bytes from audio file");
+    Serial.print(" bytes from audio file in ");
+    Serial.print(millis() - b4);
+    Serial.println("ms");
   }
 }