diff --git a/README.md b/README.md
index 911a0f3..ec9c8ab 100644
--- a/README.md
+++ b/README.md
@@ -6,7 +6,7 @@ Repository for emulation of old game systems and other old computing systems
 - [ ] Support for more controller types
 - [x] Full support for controllers 3 and 4
 - [x] Implement battery backed cartridge ram
-- [ ] Network play
+- [x] Network play
 - [ ] More mapper support
 - [x] Rewind support
 - [x] Recording support
@@ -16,7 +16,7 @@ Repository for emulation of old game systems and other old computing systems
 - [x] wix installer for windows
 - [ ] Add a list of instructions to the debugger
 - [x] Create link to recordings folder
-- [ ] Slow motion
+- [x] Slow motion
 - [x] Rom ranking system
 - [x] Game genie code support
 - [x] Full screen support
diff --git a/nes/rust/src/motherboard.rs b/nes/rust/src/motherboard.rs
index 7ead46a..7dd9fe2 100644
--- a/nes/rust/src/motherboard.rs
+++ b/nes/rust/src/motherboard.rs
@@ -34,6 +34,8 @@ pub struct NesMotherboard {
     #[serde(skip)]
     /// The controllers for the system
     controllers: [NesController; 2],
+    /// The speed ratio applied to the emulator
+    pub speed_ratio: f32,
 }
 
 impl NesMotherboard {
@@ -64,6 +66,7 @@ impl NesMotherboard {
             last_cpu_data: 0,
             last_ppu_coordinates: (0, 0),
             controllers: [NesController::default(), NesController::default()],
+            speed_ratio: 1.0,
         }
     }
 
diff --git a/nes/rust/src/windows/genie.rs b/nes/rust/src/windows/genie.rs
index 2658a5d..2b47e01 100644
--- a/nes/rust/src/windows/genie.rs
+++ b/nes/rust/src/windows/genie.rs
@@ -6,7 +6,7 @@ use crate::NesEmulatorData;
 use eframe::egui;
 
 #[cfg(feature = "egui-multiwin")]
-use egui_multiwin::{arboard, egui, egui_glow::EguiGlow};
+use egui_multiwin::{arboard, egui_glow::EguiGlow};
 
 #[cfg(feature = "egui-multiwin")]
 use crate::egui_multiwin_dynamic::{
diff --git a/nes/rust/src/windows/main.rs b/nes/rust/src/windows/main.rs
index 56549f5..c6fedd9 100644
--- a/nes/rust/src/windows/main.rs
+++ b/nes/rust/src/windows/main.rs
@@ -365,7 +365,8 @@ impl TrackedWindow for MainNesWindow {
         c.mb.get_controller_mut(2).rapid_fire(frame_time);
         c.mb.get_controller_mut(3).rapid_fire(frame_time);
 
-        let emulator_frame = std::time::Duration::from_nanos(1_000_000_000u64 / 60);
+        let nanos = 1_000_000_000.0 / (60.0 * c.mb.speed_ratio);
+        let emulator_frame = std::time::Duration::from_nanos(nanos as u64);
         let mut render = false;
         self.emulator_time += frame_time;
         while self.emulator_time > emulator_frame {
@@ -774,6 +775,17 @@ impl TrackedWindow for MainNesWindow {
             rewind_state = true;
         }
 
+        if egui
+            .egui_ctx
+            .input(|i| i.key_pressed(egui_multiwin::egui::Key::F11))
+        {
+            if c.mb.speed_ratio < 1.0 {
+                c.mb.speed_ratio = 1.0;
+            } else {
+                c.mb.speed_ratio = 0.5;
+            }
+        }
+
         if egui
             .egui_ctx
             .input(|i| i.key_pressed(egui_multiwin::egui::Key::F12))