diff --git a/Cargo.lock b/Cargo.lock
index 87493da..553f583 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -414,6 +414,7 @@ dependencies = [
  "futures",
  "gilrs",
  "minifb",
+ "once_cell",
  "rand",
  "ringbuf",
  "samplerate",
@@ -863,9 +864,9 @@ dependencies = [
 
 [[package]]
 name = "once_cell"
-version = "1.17.0"
+version = "1.17.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6f61fba1741ea2b3d6a1e3178721804bb716a68a6aeba1149b5d52e3d464ea66"
+checksum = "b7e5500299e16ebb147ae15a00a942af264cf3688f47923b8fc2cd5858f23ad3"
 
 [[package]]
 name = "orbclient"
diff --git a/Cargo.toml b/Cargo.toml
index 8f5958c..432fdf9 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -16,3 +16,4 @@ cpal = "0.15.0"
 ringbuf = "0.3.2"
 async-ringbuf = "0.1.2"
 futures = "0.3.26"
+once_cell = "1.17.1"
diff --git a/src/main.rs b/src/main.rs
index 6e975a3..da06d81 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -6,6 +6,7 @@ mod util;
 use clap::{ArgGroup, Parser};
 use gilrs::Gilrs;
 use minifb::{Window, WindowOptions};
+use once_cell::sync::OnceCell;
 use processor::{
     memory::{Memory, Rom},
     Cpu,
@@ -13,9 +14,10 @@ use processor::{
 use std::{
     fs,
     io::{self, stdout, Write},
-    sync::RwLock,
 };
 
+use crate::processor::gpu;
+
 #[macro_export]
 macro_rules! verbose_println {
     ($($tts:tt)*) => {
@@ -66,23 +68,34 @@ struct Args {
     /// Step emulation by...
     #[arg(long)]
     step_by: Option<usize>,
+
+    /// Step emulation by...
+    #[arg(short, long)]
+    scale_factor: Option<usize>,
 }
 
 static mut PAUSE_ENABLED: bool = false;
 static mut PAUSE_QUEUED: bool = false;
 
-static VERBOSE: RwLock<bool> = RwLock::new(false);
+static VERBOSE: OnceCell<bool> = OnceCell::new();
 
 const WIDTH: usize = 160;
 const HEIGHT: usize = 144;
-const FACTOR: usize = 3;
+static FACTOR: OnceCell<usize> = OnceCell::new();
 
 fn main() {
     let args = Args::parse();
-    {
-        let mut v = VERBOSE.write().unwrap();
-        *v = args.verbose;
-    }
+
+    VERBOSE.set(args.verbose).unwrap();
+
+    FACTOR
+        .set(if let Some(factor) = args.scale_factor {
+            factor
+        } else {
+            3
+        })
+        .unwrap();
+    gpu::init_statics();
 
     let rom: Rom = match fs::read(args.rom) {
         Ok(data) => Rom::load(data),
@@ -101,8 +114,8 @@ fn main() {
 
     let mut window = Window::new(
         format!("{} on {}", rom.get_title(), rom.mbc_type()).as_str(),
-        WIDTH * FACTOR,
-        HEIGHT * FACTOR,
+        WIDTH * FACTOR.get().unwrap(),
+        HEIGHT * FACTOR.get().unwrap(),
         WindowOptions::default(),
     )
     .unwrap_or_else(|e| {
@@ -196,8 +209,8 @@ fn print_cycles(cycles: &i32) {
 }
 
 fn is_verbose() -> bool {
-    match VERBOSE.read() {
-        Ok(v) => *v,
-        Err(_) => false,
+    match VERBOSE.get() {
+        Some(v) => *v,
+        None => false,
     }
 }
diff --git a/src/processor/gpu.rs b/src/processor/gpu.rs
index 237bfb1..7a66423 100644
--- a/src/processor/gpu.rs
+++ b/src/processor/gpu.rs
@@ -10,14 +10,24 @@ use crate::{
     FACTOR, HEIGHT, WIDTH,
 };
 use minifb::{Window, WindowOptions};
+use once_cell::sync::OnceCell;
 
 mod tile_window;
 mod types;
 
 const TILE_WINDOW_WIDTH: usize = 16 * 8;
 const TILE_WINDOW_HEIGHT: usize = 24 * 8;
-const TILE_WINDOW_WIDTH_SCALED: usize = TILE_WINDOW_WIDTH * FACTOR;
-const TILE_WINDOW_HEIGHT_SCALED: usize = TILE_WINDOW_HEIGHT * FACTOR;
+static TILE_WINDOW_WIDTH_SCALED: OnceCell<usize> = OnceCell::new();
+static TILE_WINDOW_HEIGHT_SCALED: OnceCell<usize> = OnceCell::new();
+
+pub fn init_statics() {
+    TILE_WINDOW_WIDTH_SCALED
+        .set(TILE_WINDOW_WIDTH * FACTOR.get().unwrap())
+        .unwrap();
+    TILE_WINDOW_HEIGHT_SCALED
+        .set(TILE_WINDOW_HEIGHT * FACTOR.get().unwrap())
+        .unwrap();
+}
 
 pub struct Gpu {
     pub buffer: Vec<u32>,
@@ -35,15 +45,15 @@ impl Gpu {
         let tile_window = if enable_tile_window {
             let mut window = Window::new(
                 "Tiles",
-                TILE_WINDOW_WIDTH_SCALED,
-                TILE_WINDOW_HEIGHT_SCALED,
+                *TILE_WINDOW_WIDTH_SCALED.get().unwrap(),
+                *TILE_WINDOW_HEIGHT_SCALED.get().unwrap(),
                 WindowOptions::default(),
             )
             .unwrap_or_else(|e| {
                 panic!("{e}");
             });
 
-            window.set_position((550 + (WIDTH * FACTOR)) as isize, 50);
+            window.set_position((550 + (WIDTH * FACTOR.get().unwrap())) as isize, 50);
             window.topmost(true);
             Some(TileWindow::new(window))
         } else {
@@ -406,9 +416,14 @@ impl Cpu {
     }
 
     fn render_window(&mut self) {
-        self.gpu.scaled_buffer = scale_buffer(&self.gpu.buffer, WIDTH, HEIGHT, FACTOR);
+        self.gpu.scaled_buffer =
+            scale_buffer(&self.gpu.buffer, WIDTH, HEIGHT, *FACTOR.get().unwrap());
         self.window
-            .update_with_buffer(&self.gpu.scaled_buffer, WIDTH * FACTOR, HEIGHT * FACTOR)
+            .update_with_buffer(
+                &self.gpu.scaled_buffer,
+                WIDTH * FACTOR.get().unwrap(),
+                HEIGHT * FACTOR.get().unwrap(),
+            )
             .unwrap();
     }
 }
diff --git a/src/processor/gpu/tile_window.rs b/src/processor/gpu/tile_window.rs
index f370728..f60a2b1 100644
--- a/src/processor/gpu/tile_window.rs
+++ b/src/processor/gpu/tile_window.rs
@@ -22,7 +22,11 @@ impl TileWindow {
     pub(super) fn new(window: Window) -> Self {
         Self {
             sprite_buffer: vec![0; TILE_WINDOW_WIDTH * TILE_WINDOW_HEIGHT],
-            sprite_buffer_scaled: vec![0; TILE_WINDOW_WIDTH_SCALED * TILE_WINDOW_HEIGHT_SCALED],
+            sprite_buffer_scaled: vec![
+                0;
+                TILE_WINDOW_WIDTH_SCALED.get().unwrap()
+                    * TILE_WINDOW_HEIGHT_SCALED.get().unwrap()
+            ],
             sprite_window: window,
         }
     }
@@ -53,13 +57,13 @@ impl TileWindow {
             &self.sprite_buffer,
             TILE_WINDOW_WIDTH,
             TILE_WINDOW_HEIGHT,
-            FACTOR,
+            *FACTOR.get().unwrap(),
         );
         self.sprite_window
             .update_with_buffer(
                 &self.sprite_buffer_scaled,
-                TILE_WINDOW_WIDTH_SCALED,
-                TILE_WINDOW_HEIGHT_SCALED,
+                *TILE_WINDOW_WIDTH_SCALED.get().unwrap(),
+                *TILE_WINDOW_HEIGHT_SCALED.get().unwrap(),
             )
             .unwrap();
     }