diff --git a/src/bus.rs b/src/bus.rs
index 1b7f4d8..bc26521 100644
--- a/src/bus.rs
+++ b/src/bus.rs
@@ -64,10 +64,12 @@ impl Bus {
         self.boot.is_some()
     }
 
+    #[inline]
     pub(crate) fn clock(&mut self) {
         self.tick(4);
     }
 
+    #[inline]
     fn tick(&mut self, limit: u8) {
         for _ in 0..limit {
             self.timer.tick();
@@ -83,6 +85,11 @@ impl Bus {
             self.oam_write_byte(dest_addr, byte);
         }
     }
+
+    #[inline]
+    pub(crate) fn joyp_mut(&mut self) -> &mut Joypad {
+        &mut self.joypad
+    }
 }
 
 impl Bus {
diff --git a/src/cpu.rs b/src/cpu.rs
index 5b1ab1b..6694cbd 100644
--- a/src/cpu.rs
+++ b/src/cpu.rs
@@ -156,10 +156,12 @@ impl BusIo for Cpu {
 }
 
 impl Cpu {
+    #[inline]
     pub(crate) fn bus(&self) -> &Bus {
         &self.bus
     }
 
+    #[inline]
     pub(crate) fn bus_mut(&mut self) -> &mut Bus {
         &mut self.bus
     }
diff --git a/src/emu.rs b/src/emu.rs
index d62d787..a2d4c02 100644
--- a/src/emu.rs
+++ b/src/emu.rs
@@ -17,8 +17,8 @@ pub fn run_frame(emu: &mut Emulator, gamepad: &mut Gilrs, key: &WinitInputHelper
     if let Some(event) = gamepad.next_event() {
         joypad::handle_gamepad_input(emu.joyp_mut(), event);
     }
-
     joypad::handle_keyboard_input(emu.joyp_mut(), key);
+
     while elapsed < CYCLES_IN_FRAME {
         elapsed += emu.step();
     }
@@ -44,15 +44,18 @@ impl Emulator {
     }
 
     fn step(&mut self) -> Cycle {
-        self.cpu.step()
+        let cycles = self.cpu.step();
+        self.timestamp += cycles;
+        cycles
     }
 
     fn load_cart(&mut self, rom: Vec<u8>) {
         self.cpu.bus_mut().load_cart(rom)
     }
 
+    #[inline]
     fn joyp_mut(&mut self) -> &mut Joypad {
-        &mut self.cpu.bus_mut().joypad
+        self.cpu.bus_mut().joyp_mut()
     }
 
     pub fn set_prod(&mut self, prod: SampleProducer<f32>) {
diff --git a/src/joypad.rs b/src/joypad.rs
index 06cc9f5..5c5bf88 100644
--- a/src/joypad.rs
+++ b/src/joypad.rs
@@ -110,6 +110,7 @@ impl ButtonEvent {
     }
 }
 
+#[inline]
 pub fn handle_keyboard_input(pad: &mut Joypad, input: &WinitInputHelper) {
     use winit::event::VirtualKeyCode;
 
@@ -175,6 +176,7 @@ pub fn handle_keyboard_input(pad: &mut Joypad, input: &WinitInputHelper) {
     }
 }
 
+#[inline]
 pub fn handle_gamepad_input(pad: &mut Joypad, event: GamepadEvent) {
     use Button::*;
     use GamepadEventType::*;
diff --git a/src/main.rs b/src/main.rs
index 41c0b63..48a9a8b 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -14,7 +14,7 @@ use winit::window::{Window, WindowBuilder};
 use winit_input_helper::WinitInputHelper;
 
 const WINDOW_SCALE: usize = 3;
-const AUDIO_ENABLED: bool = false;
+const AUDIO_ENABLED: bool = true;
 
 fn main() -> Result<()> {
     let app = App::new(crate_name!())
diff --git a/src/ppu.rs b/src/ppu.rs
index 4cc7491..51fe9b5 100644
--- a/src/ppu.rs
+++ b/src/ppu.rs
@@ -629,6 +629,7 @@ impl ObjectBuffer {
         self.len += 1;
     }
 
+    #[inline]
     fn iter_mut(&mut self) -> std::slice::IterMut<'_, Option<ObjectAttribute>> {
         self.inner.iter_mut()
     }