diff --git a/src/editor.rs b/src/editor.rs
index 4c88ec5..0cb0d7c 100644
--- a/src/editor.rs
+++ b/src/editor.rs
@@ -2,6 +2,7 @@ use std::{
 	fs::{read_dir, read_to_string},
 	mem::transmute,
 	ops::Rem,
+	time::Instant,
 };
 
 use raylib::prelude::*;
@@ -30,6 +31,7 @@ const MAX_ZOOM_IN: i32 = 3;
 const BOARD_MARGIN: isize = 3;
 const MAX_SPEED_POWER: u8 = 16;
 const SPEED_DIGITS: u8 = 5;
+const MAX_FRAME_TIME_MICROS: u128 = 1000_000 / 30;
 
 #[derive(Debug)]
 pub struct Editor {
@@ -178,7 +180,7 @@ impl Editor {
 	}
 
 	fn step(&mut self) {
-		let start_time = std::time::Instant::now();
+		let start_time = Instant::now();
 		self.machine.step();
 		self.step_time = start_time.elapsed().as_micros();
 
@@ -334,11 +336,15 @@ impl Editor {
 			let step_size = 1. / (1 << self.sim_speed) as f32;
 			if self.time_since_step > step_size {
 				let step_count = (self.time_since_step / step_size) as u32;
+				let start_time = Instant::now();
 				for _ in 0..step_count {
 					if self.sim_state != SimState::Running {
 						// pause on level completion
 						break;
 					}
+					if start_time.elapsed().as_micros() > MAX_FRAME_TIME_MICROS {
+						break;
+					}
 					self.step();
 				}
 				self.time_since_step -= step_count as f32 * step_size;