diff --git a/beacon/src/lib.rs b/beacon/src/lib.rs
index 103ec567..b05ea14d 100644
--- a/beacon/src/lib.rs
+++ b/beacon/src/lib.rs
@@ -13,6 +13,7 @@ pub use span::Span;
 use crate::core::theme;
 use crate::core::time::{Duration, SystemTime};
 use crate::error::Error;
+use crate::span::present;
 
 use futures::{SinkExt, Stream};
 use tokio::io::{self, AsyncReadExt, AsyncWriteExt};
@@ -128,8 +129,9 @@ pub fn run() -> impl Stream<Item = Event> {
             let mut last_update_number = 0;
             let mut last_tasks = 0;
             let mut last_subscriptions = 0;
-            let mut last_present_window = None;
             let mut last_present_layers = 0;
+            let mut last_prepare = present::Stage::default();
+            let mut last_render = present::Stage::default();
 
             drop(task::spawn(async move {
                 let mut last_message_number = None;
@@ -215,11 +217,6 @@ pub fn run() -> impl Stream<Item = Event> {
                                         last_message.clear();
                                         last_tasks = 0;
                                     }
-                                    client::Event::SpanStarted(
-                                        span::Stage::Present(window),
-                                    ) => {
-                                        last_present_window = Some(window);
-                                    }
                                     client::Event::SpanStarted(_) => {}
                                     client::Event::SpanFinished(
                                         stage,
@@ -249,35 +246,44 @@ pub fn run() -> impl Stream<Item = Event> {
                                             span::Stage::Draw(window) => {
                                                 Span::Draw { window }
                                             }
-                                            span::Stage::Prepare(primitive) => {
-                                                let Some(window) =
-                                                    last_present_window
-                                                else {
-                                                    continue;
+                                            span::Stage::Prepare(primitive)
+                                            | span::Stage::Render(primitive) => {
+                                                let stage = if matches!(
+                                                    stage,
+                                                    span::Stage::Prepare(_),
+                                                ) {
+                                                    &mut last_prepare
+                                                } else {
+                                                    &mut last_render
                                                 };
 
-                                                Span::Prepare {
-                                                    window,
-                                                    primitive,
-                                                }
-                                            }
-                                            span::Stage::Render(primitive) => {
-                                                let Some(window) =
-                                                    last_present_window
-                                                else {
-                                                    continue;
+                                                let primitive = match primitive {
+                                                    present::Primitive::Quad => &mut stage.quads,
+                                                    present::Primitive::Triangle => &mut stage.triangles,
+                                                    present::Primitive::Shader => &mut stage.shaders,
+                                                    present::Primitive::Text => &mut stage.text,
+                                                    present::Primitive::Image => &mut stage.images,
                                                 };
 
-                                                Span::Render {
-                                                    window,
-                                                    primitive,
-                                                }
+                                                *primitive += duration;
+
+                                                continue;
                                             }
                                             span::Stage::Present(window) => {
-                                                Span::Present {
+                                                let span = Span::Present {
                                                     window,
+                                                    prepare: last_prepare,
+                                                    render: last_render,
                                                     layers: last_present_layers,
-                                                }
+                                                };
+
+                                                last_prepare =
+                                                    present::Stage::default();
+                                                last_render =
+                                                    present::Stage::default();
+                                                last_present_layers = 0;
+
+                                                span
                                             }
                                             span::Stage::Custom(name) => {
                                                 Span::Custom { name }
diff --git a/beacon/src/span.rs b/beacon/src/span.rs
index 8a266acc..690982cc 100644
--- a/beacon/src/span.rs
+++ b/beacon/src/span.rs
@@ -23,16 +23,10 @@ pub enum Span {
     Draw {
         window: window::Id,
     },
-    Prepare {
-        window: window::Id,
-        primitive: Primitive,
-    },
-    Render {
-        window: window::Id,
-        primitive: Primitive,
-    },
     Present {
         window: window::Id,
+        prepare: present::Stage,
+        render: present::Stage,
         layers: usize,
     },
     Custom {
@@ -40,43 +34,6 @@ pub enum Span {
     },
 }
 
-#[derive(
-    Debug,
-    Clone,
-    Copy,
-    PartialEq,
-    Eq,
-    PartialOrd,
-    Ord,
-    Hash,
-    Serialize,
-    Deserialize,
-)]
-pub enum Primitive {
-    Quad,
-    Triangle,
-    Shader,
-    Text,
-    Image,
-}
-
-impl Span {
-    pub fn stage(&self) -> Stage {
-        match self {
-            Span::Boot => Stage::Boot,
-            Span::Update { .. } => Stage::Update,
-            Span::View { window } => Stage::View(*window),
-            Span::Layout { window } => Stage::Layout(*window),
-            Span::Interact { window } => Stage::Interact(*window),
-            Span::Draw { window } => Stage::Draw(*window),
-            Span::Prepare { primitive, .. } => Stage::Prepare(*primitive),
-            Span::Render { primitive, .. } => Stage::Render(*primitive),
-            Span::Present { window, .. } => Stage::Present(*window),
-            Span::Custom { name, .. } => Stage::Custom(name.clone()),
-        }
-    }
-}
-
 #[derive(
     Debug, Clone, PartialEq, Eq, PartialOrd, Ord, Hash, Serialize, Deserialize,
 )]
@@ -88,8 +45,8 @@ pub enum Stage {
     Interact(window::Id),
     Draw(window::Id),
     Present(window::Id),
-    Prepare(Primitive),
-    Render(Primitive),
+    Prepare(present::Primitive),
+    Render(present::Primitive),
     Custom(String),
 }
 
@@ -109,3 +66,38 @@ impl std::fmt::Display for Stage {
         })
     }
 }
+
+pub mod present {
+    use crate::core::time::Duration;
+
+    use serde::{Deserialize, Serialize};
+
+    #[derive(Debug, Clone, PartialEq, Eq, PartialOrd, Ord, Hash, Default)]
+    pub struct Stage {
+        pub quads: Duration,
+        pub triangles: Duration,
+        pub shaders: Duration,
+        pub text: Duration,
+        pub images: Duration,
+    }
+
+    #[derive(
+        Debug,
+        Clone,
+        Copy,
+        PartialEq,
+        Eq,
+        PartialOrd,
+        Ord,
+        Hash,
+        Serialize,
+        Deserialize,
+    )]
+    pub enum Primitive {
+        Quad,
+        Triangle,
+        Shader,
+        Text,
+        Image,
+    }
+}
diff --git a/debug/src/lib.rs b/debug/src/lib.rs
index 6933b241..17463f9a 100644
--- a/debug/src/lib.rs
+++ b/debug/src/lib.rs
@@ -126,6 +126,7 @@ mod internal {
 
     use beacon::client::{self, Client};
     use beacon::span;
+    use beacon::span::present;
 
     use std::sync::atomic::{self, AtomicBool, AtomicUsize};
     use std::sync::{LazyLock, RwLock};
@@ -279,13 +280,13 @@ mod internal {
         }
     }
 
-    fn to_primitive(primitive: Primitive) -> span::Primitive {
+    fn to_primitive(primitive: Primitive) -> present::Primitive {
         match primitive {
-            Primitive::Quad => span::Primitive::Quad,
-            Primitive::Triangle => span::Primitive::Triangle,
-            Primitive::Shader => span::Primitive::Shader,
-            Primitive::Text => span::Primitive::Text,
-            Primitive::Image => span::Primitive::Image,
+            Primitive::Quad => present::Primitive::Quad,
+            Primitive::Triangle => present::Primitive::Triangle,
+            Primitive::Shader => present::Primitive::Shader,
+            Primitive::Text => present::Primitive::Text,
+            Primitive::Image => present::Primitive::Image,
         }
     }