diff --git a/benches/benchmarks.rs b/benches/benchmarks.rs
index 1a016d7..2c844a4 100644
--- a/benches/benchmarks.rs
+++ b/benches/benchmarks.rs
@@ -1,5 +1,8 @@
 use std::{
-    sync::{Arc, RwLock},
+    sync::{
+        atomic::{AtomicU64, AtomicUsize, Ordering::Relaxed},
+        Arc, RwLock,
+    },
     thread,
 };
 
@@ -8,21 +11,15 @@ struct Point2d {
     y: f64,
 }
 
-#[derive(Debug, Default, Clone, Copy, PartialEq, Eq, PartialOrd, Ord)]
-struct PointRef2d {
-    x: usize,
-    y: usize,
-}
-
-#[derive(Debug, Default, Clone, Copy)]
+#[derive(Debug, Default)]
 struct PVal {
     point: usize,
-    val: f64,
+    val: AtomicU64,
 }
 
 impl PartialEq for PVal {
     fn eq(&self, other: &Self) -> bool {
-        self.val == other.val
+        self.val.load(Relaxed) == other.val.load(Relaxed)
     }
 }
 
@@ -30,7 +27,9 @@ impl Eq for PVal {}
 
 impl PartialOrd for PVal {
     fn partial_cmp(&self, other: &Self) -> Option<std::cmp::Ordering> {
-        self.val.partial_cmp(&other.val)
+        let a = f64::from_bits(self.val.load(Relaxed));
+        let b = f64::from_bits(other.val.load(Relaxed));
+        a.partial_cmp(&b)
     }
 }
 
@@ -41,33 +40,37 @@ impl Ord for PVal {
 }
 
 struct Spindex2d {
-    points: Arc<Vec<RwLock<PointRef2d>>>,
-    xs: Arc<RwLock<Vec<RwLock<PVal>>>>,
-    ys: Arc<RwLock<Vec<RwLock<PVal>>>>,
+    xpoints: Arc<Vec<AtomicUsize>>,
+    ypoints: Arc<Vec<AtomicUsize>>,
+    xs: Arc<RwLock<Vec<PVal>>>,
+    ys: Arc<RwLock<Vec<PVal>>>,
 }
 
 impl Spindex2d {
     pub fn new(points: &[Point2d]) -> Self {
-        let mut ps = Vec::with_capacity(points.len());
+        let mut xpoints = Vec::with_capacity(points.len());
+        let mut ypoints = Vec::with_capacity(points.len());
         let mut xs = Vec::with_capacity(points.len());
         let mut ys = Vec::with_capacity(points.len());
         for (i, point) in points.iter().enumerate() {
             let x = PVal {
                 point: i,
-                val: point.x,
+                val: AtomicU64::new(point.x.to_bits()),
             };
-            xs.push(x.into());
+            xs.push(x);
             let y = PVal {
                 point: i,
-                val: point.y,
+                val: AtomicU64::new(point.y.to_bits()),
             };
-            ys.push(y.into());
-            let p = PointRef2d { x: i, y: i };
-            ps.push(p.into());
+            ys.push(y);
+
+            xpoints.push(AtomicUsize::new(i));
+            ypoints.push(AtomicUsize::new(i));
         }
 
         let index = Self {
-            points: ps.into(),
+            xpoints: xpoints.into(),
+            ypoints: ypoints.into(),
             xs: Arc::new(RwLock::new(xs)),
             ys: Arc::new(RwLock::new(ys)),
         };
@@ -81,53 +84,48 @@ impl Spindex2d {
     /// when constructing this index. May panic if the updated points argument is longer than the
     /// original points.
     pub fn update(&self, points: &[Point2d]) {
-        todo!()
+        let mut xs = self.xs.write().unwrap();
+        let mut ys = self.ys.write().unwrap();
+        for (i, point) in points.iter().enumerate() {
+            let xi = self.xpoints[i].load(Relaxed);
+            let yi = self.ypoints[i].load(Relaxed);
+            let x = point.x.to_bits();
+            let x = PVal {
+                point: i,
+                val: x.into(),
+            };
+            xs[xi] = x;
+
+            let y = point.y.to_bits();
+            let y = PVal {
+                point: i,
+                val: y.into(),
+            };
+            ys[yi] = y;
+        }
+        self.sort();
     }
 
     fn sort(&self) {
         let xs = self.xs.clone();
+        let points = self.xpoints.clone();
         let xhandle = thread::spawn(move || {
             let mut xs = xs.write().unwrap();
-            xs.sort_unstable_by(|a, b| {
-                let a = a.read().unwrap();
-                let b = b.read().unwrap();
-                a.cmp(&b)
-            });
-        });
-
-        let ys = self.ys.clone();
-        let yhandle = thread::spawn(move || {
-            let mut ys = ys.write().unwrap();
-            ys.sort_unstable_by(|a, b| {
-                let a = a.read().unwrap();
-                let b = b.read().unwrap();
-                a.cmp(&b)
-            });
-        });
-
-        xhandle.join().unwrap();
-        yhandle.join().unwrap();
-
-        let xs = self.xs.clone();
-        let points = self.points.clone();
-        let xhandle = thread::spawn(move || {
-            let xs = xs.read().unwrap();
+            xs.sort_unstable();
             for (i, x) in xs.iter().enumerate() {
-                let x = x.read().unwrap();
                 let p = x.point;
-                points[p].write().unwrap().x = i;
+                points[p].store(i, Relaxed);
             }
         });
 
         let ys = self.ys.clone();
-        let points = self.points.clone();
+        let points = self.ypoints.clone();
         let yhandle = thread::spawn(move || {
-            let ys = ys.read().unwrap();
-
+            let mut ys = ys.write().unwrap();
+            ys.sort_unstable();
             for (i, y) in ys.iter().enumerate() {
-                let y = y.read().unwrap();
                 let p = y.point;
-                points[p].write().unwrap().y = i;
+                points[p].store(i, Relaxed);
             }
         });
 
@@ -185,11 +183,16 @@ fn update_positions(c: &mut Criterion) {
 
         let index = Spindex2d::new(&points);
         let mut round = 0;
-        b.iter(|| todo!());
+        b.iter(|| {
+            if round % 2 == 0 {
+                index.update(&jitters);
+            } else {
+                index.update(&points);
+            }
+            round += 1;
+        });
     });
 }
 
-//fn reuse_index(_c: &mut Criterion) {}
-
 criterion_group!(benches, new_index);
 criterion_main!(benches);