diff --git a/src/solver/mod.rs b/src/solver/mod.rs
index 6a236a0..c536b26 100644
--- a/src/solver/mod.rs
+++ b/src/solver/mod.rs
@@ -70,33 +70,40 @@ impl Solver {
 	} 
 
 	pub fn solve(&mut self, solver_limit: Option<usize>) -> Result<(), WaveError> {
-		let now = Instant::now();
+		let start_time = Instant::now();
 		self.display(ui::DisplayMode::Full);
 	    		
-	    let mut propagation_counter: usize = 0;
-	    let mut collapse_counter: usize = 0;
+	    let mut propagation_counter: (usize, std::time::Duration) = (0, std::time::Duration::ZERO);
+	    let mut collapse_counter: (usize, std::time::Duration) = (0, std::time::Duration::ZERO);
+	    let mut backtrack_counter: (usize, std::time::Duration) = (0, std::time::Duration::ZERO);
 		println!("# started");
 		self.debug("--------");
 
 		while self.history.len() < self.size * self.size {
 			self.debug(&format!("\n## while, h={}/{}", self.last_move_index, self.history.len()));
 			while self.last_move_index < self.history.len() && self.history.len() < self.size * self.size {
-				let mut backtrack = 0;
+				let mut need_backtrack = false;
+				
+				let propagation_start = Instant::now();
 				match self.propagate_collapse() {
 					Ok(_) => {},
 					Err(reason) => {
 						if let WaveError::Contradiction = reason {
-							backtrack = 1;
+							need_backtrack = true;
 						} else {
 							return Err(reason)
 						}
 					}
 				};
-				while backtrack > 0 {
-					backtrack -=1;
+				propagation_counter.0 += 1;
+				propagation_counter.1 += propagation_start.elapsed();
+				
+				if need_backtrack {
+					let backtrack_start = Instant::now();
 					self.backtrack()?;
+					backtrack_counter.0 += 1;
+					backtrack_counter.1 += backtrack_start.elapsed();
 				}
-				propagation_counter += 1;
 			}
 
 			if self.grid_display {
@@ -107,21 +114,34 @@ impl Solver {
 				}			
 			}
 			
-			self.collapse()?;
-			collapse_counter += 1;
+			let collapse_start = Instant::now();
+	        self.collapse()?;
+			collapse_counter.0 += 1;
+			collapse_counter.1 += collapse_start.elapsed();
 			
 			if !self.debug_display && !self.grid_display {
 				self.progress_bar();
 		    }
 		    if let Some(limit) = solver_limit {
-		    	if collapse_counter >= limit {
+		    	if collapse_counter.0 >= limit {
 		    		break;
 		    	}
 		    }
 		}
 		self.debug("--------");
-	    let elapsed = now.elapsed();
-	    println!("\n# finished in {} propagations ({} forced collapse), {:.2?} ({:.2?}/propagation)", propagation_counter, collapse_counter, elapsed, elapsed/(propagation_counter as u32));
+	    let total_elapsed = start_time.elapsed();
+	    let propagation_percentage = (propagation_counter.1.as_secs_f64() / total_elapsed.as_secs_f64()) * 100.0;
+        let collapse_percentage = (collapse_counter.1.as_secs_f64() / total_elapsed.as_secs_f64()) * 100.0;
+        let backtrack_percentage = (backtrack_counter.1.as_secs_f64() / total_elapsed.as_secs_f64()) * 100.0;
+	    
+	    println!("\n# finished in {:.2?} ({:.2?}% propagation, {:.2?}% forced collapse, {:.2?}% backtrack)", 
+	    	total_elapsed, propagation_percentage, collapse_percentage, backtrack_percentage
+	    );
+		println!("- {} propagations ({:.2?}), {} forced collapse ({:.2?}), {} backtrack ({:.2?})", 
+			propagation_counter.0, (propagation_counter.1.checked_div(propagation_counter.0 as u32)).unwrap_or(std::time::Duration::ZERO), 
+			collapse_counter.0, (collapse_counter.1.checked_div(collapse_counter.0 as u32)).unwrap_or(std::time::Duration::ZERO), 
+			backtrack_counter.0, (backtrack_counter.1.checked_div(backtrack_counter.0 as u32)).unwrap_or(std::time::Duration::ZERO)
+		);
 		if !self.grid_display || self.debug_display {
 			self.display(ui::DisplayMode::Full);
 		}
diff --git a/todo b/todo
deleted file mode 100644
index c9a2301..0000000
--- a/todo
+++ /dev/null
@@ -1,9 +0,0 @@
-more check for impossible
-
-
-cargo run 4 --grid --debug --ask --norand --limit 220
---d-fc-g
-
-error :
-when backtracking, always adding the state back is wrong 
-(maybe it was not there)