diff --git a/src/game.rs b/src/game.rs
index 5aa32b9..be10882 100644
--- a/src/game.rs
+++ b/src/game.rs
@@ -57,7 +57,6 @@ impl Game {
 
         let song = Sound::create(dir.join(&self.beatmap.audio_filename))?;
         song.set_position(113.0)?;
-        song.set_playback_rate(0.6);
         self.song = Some(song);
 
         Ok(())
@@ -129,10 +128,11 @@ impl Game {
             }
         }
 
+        let cs_scale = EDITOR_SCREEN.w / 640.0;
         let osupx_scale_x = EDITOR_SCREEN.w / 512.0;
         let osupx_scale_y = EDITOR_SCREEN.h / 384.0;
         let cs_osupx = self.beatmap.difficulty.circle_size_osupx();
-        let cs_real = cs_osupx * osupx_scale_x;
+        let cs_real = cs_osupx * cs_scale;
 
         for draw_info in visible_hitobjects.iter() {
             let ho = draw_info.hit_object;
@@ -166,7 +166,7 @@ impl Game {
                         travel_percent = 1.0 - travel_percent;
                     }
                     let travel_length = travel_percent * info.pixel_length;
-                    let pos = spline.position_at_length(travel_length);
+                    let pos = spline.point_at_length(travel_length);
                     let ball_pos = [
                         EDITOR_SCREEN.x + osupx_scale_x * pos.0 as f32,
                         EDITOR_SCREEN.y + osupx_scale_y * pos.1 as f32,
diff --git a/src/slider_render.rs b/src/slider_render.rs
index 6a6ff9a..e5248da 100644
--- a/src/slider_render.rs
+++ b/src/slider_render.rs
@@ -38,10 +38,11 @@ pub fn render_slider<'a>(
         slider_cache.get(&control_points).unwrap()
     };
 
+    let cs_scale = rect.w / 640.0;
     let osupx_scale_x = rect.w as f64 / 512.0;
     let osupx_scale_y = rect.h as f64 / 384.0;
     let cs_osupx = beatmap.difficulty.circle_size_osupx() as f64;
-    let cs_real = cs_osupx * osupx_scale_x;
+    let cs_real = cs_osupx * cs_scale as f64;
 
     let points_mapped = control_points
         .iter()
@@ -172,13 +173,33 @@ impl Spline {
                 for i in 1..points.len() {
                     if points[i].0 == points[i - 1].0 && points[i].1 == points[i - 1].1 {
                         let spline = calculate_bezier(&points[idx..i]);
-                        whole.extend(spline);
+                        if let Some(last) = whole.last() {
+                            if spline[0] != *last {
+                                whole.push(spline[0]);
+                            }
+                        } else {
+                            whole.push(spline[0]);
+                        }
+                        for points in spline.windows(2) {
+                            if points[0] != points[1] {
+                                whole.push(points[1]);
+                            }
+                        }
                         idx = i;
                         continue;
                     }
                 }
                 let spline = calculate_bezier(&points[idx..]);
-                whole.extend(spline);
+                if let Some(last) = whole.last() {
+                    if spline[0] != *last {
+                        whole.push(spline[0]);
+                    }
+                }
+                for points in spline.windows(2) {
+                    if points[0] != points[1] {
+                        whole.push(points[1]);
+                    }
+                }
                 whole
             }
             _ => todo!(),
@@ -186,6 +207,8 @@ impl Spline {
 
         let mut cumulative_lengths = Vec::with_capacity(spline_points.len());
         let mut curr = 0.0;
+        // using NotNan here because these need to be binary-searched over
+        // and f64 isn't Ord
         cumulative_lengths.push(unsafe { NotNan::unchecked_new(curr) });
         for points in spline_points.windows(2) {
             let dist = points[0].distance(points[1]);
@@ -199,7 +222,7 @@ impl Spline {
         }
     }
 
-    pub fn position_at_length(&self, length: f64) -> P {
+    pub fn point_at_length(&self, length: f64) -> P {
         let length_notnan = unsafe { NotNan::unchecked_new(length) };
         match self.cumulative_lengths.binary_search(&length_notnan) {
             Ok(idx) => self.spline_points[idx],
@@ -212,12 +235,13 @@ impl Spline {
                 }
 
                 let (len1, len2) = (
+                    self.cumulative_lengths[idx - 1].into_inner(),
                     self.cumulative_lengths[idx].into_inner(),
-                    self.cumulative_lengths[idx + 1].into_inner(),
                 );
                 let proportion = (length - len1) / (len2 - len1);
 
                 let (p1, p2) = (self.spline_points[idx], self.spline_points[idx + 1]);
+                assert!(p1 != p2);
                 (p2 - p1) * proportion + p1
             }
         }
diff --git a/todo.txt b/todo.txt
index 26ad4fe..6dc36aa 100644
--- a/todo.txt
+++ b/todo.txt
@@ -1,4 +1,5 @@
 - stacking
-- fix the overlaps in notch hell slider (circle size wrong?)
+- fix straight slider segment teleportation
 - don't draw overlaps between slider segments
 - use skin components
+- timeline