diff --git a/crates/typst-library/src/foundations/func.rs b/crates/typst-library/src/foundations/func.rs
index 27eb34eac..ca937f104 100644
--- a/crates/typst-library/src/foundations/func.rs
+++ b/crates/typst-library/src/foundations/func.rs
@@ -298,7 +298,12 @@ impl Func {
     }
 
     /// Non-generic implementation of `call`.
-    #[typst_macros::time(name = "func call", span = self.span())]
+    #[typst_macros::time(
+        name = "func call",
+        span = self.span(),
+        callsite = args.span,
+        func = self.name().unwrap_or("anonymous")
+    )]
     fn call_impl(
         &self,
         engine: &mut Engine,
diff --git a/crates/typst-macros/src/time.rs b/crates/typst-macros/src/time.rs
index 94fa4e5be..8bb24ccc5 100644
--- a/crates/typst-macros/src/time.rs
+++ b/crates/typst-macros/src/time.rs
@@ -8,13 +8,15 @@ use crate::util::{kw, parse_key_value, parse_string};
 /// Expand the `#[time(..)]` macro.
 pub fn time(stream: TokenStream, item: syn::ItemFn) -> Result<TokenStream> {
     let meta: Meta = syn::parse2(stream)?;
-    Ok(create(meta, item))
+    create(meta, item)
 }
 
 /// The `..` in `#[time(..)]`.
 pub struct Meta {
     pub span: Option<syn::Expr>,
+    pub callsite: Option<syn::Expr>,
     pub name: Option<String>,
+    pub func: Option<syn::Expr>,
 }
 
 impl Parse for Meta {
@@ -22,15 +24,37 @@ impl Parse for Meta {
         Ok(Self {
             name: parse_string::<kw::name>(input)?,
             span: parse_key_value::<kw::span, syn::Expr>(input)?,
+            callsite: parse_key_value::<kw::callsite, syn::Expr>(input)?,
+            func: parse_key_value::<kw::func, syn::Expr>(input)?,
         })
     }
 }
 
-fn create(meta: Meta, mut item: syn::ItemFn) -> TokenStream {
+fn create(meta: Meta, mut item: syn::ItemFn) -> Result<TokenStream> {
     let name = meta.name.unwrap_or_else(|| item.sig.ident.to_string());
-    let construct = match meta.span.as_ref() {
-        Some(span) => quote! { with_span(#name, Some(#span.into_raw())) },
-        None => quote! { new(#name) },
+
+    let func = match meta.func {
+        Some(func) => {
+            if meta.callsite.is_none() {
+                bail!(func, "the `func` argument can only be used with a callsite")
+            }
+
+            quote! { Some(#func.into()) }
+        }
+        None => quote! { None },
+    };
+
+    let construct = match (meta.span.as_ref(), meta.callsite.as_ref()) {
+        (Some(span), Some(callsite)) => quote! {
+            with_callsite(#name, Some(#span.into_raw()), Some(#callsite.into_raw()), #func)
+        },
+        (Some(span), None) => quote! {
+            with_span(#name, Some(#span.into_raw()))
+        },
+        (None, Some(expr)) => {
+            bail!(expr, "cannot have a callsite span without a main span")
+        }
+        (None, None) => quote! { new(#name) },
     };
 
     item.block.stmts.insert(
@@ -40,5 +64,5 @@ fn create(meta: Meta, mut item: syn::ItemFn) -> TokenStream {
         },
     );
 
-    item.into_token_stream()
+    Ok(item.into_token_stream())
 }
diff --git a/crates/typst-macros/src/util.rs b/crates/typst-macros/src/util.rs
index e8c0910b6..6c611dffc 100644
--- a/crates/typst-macros/src/util.rs
+++ b/crates/typst-macros/src/util.rs
@@ -254,6 +254,8 @@ impl Parse for BareType {
 pub mod kw {
     syn::custom_keyword!(name);
     syn::custom_keyword!(span);
+    syn::custom_keyword!(callsite);
+    syn::custom_keyword!(func);
     syn::custom_keyword!(title);
     syn::custom_keyword!(scope);
     syn::custom_keyword!(contextual);
diff --git a/crates/typst-realize/src/lib.rs b/crates/typst-realize/src/lib.rs
index 151ae76ba..21c4e5c2f 100644
--- a/crates/typst-realize/src/lib.rs
+++ b/crates/typst-realize/src/lib.rs
@@ -34,7 +34,7 @@ use typst_syntax::Span;
 use typst_utils::{SliceExt, SmallBitSet};
 
 /// Realize content into a flat list of well-known, styled items.
-#[typst_macros::time(name = "realize")]
+#[typst_macros::time(name = "realize", span = content.span())]
 pub fn realize<'a>(
     kind: RealizationKind,
     engine: &mut Engine,
diff --git a/crates/typst-timing/src/lib.rs b/crates/typst-timing/src/lib.rs
index 6da2cdf02..0c307696d 100644
--- a/crates/typst-timing/src/lib.rs
+++ b/crates/typst-timing/src/lib.rs
@@ -93,20 +93,26 @@ pub fn export_json<W: Write>(
     mut source: impl FnMut(NonZeroU64) -> (String, u32),
 ) -> Result<(), String> {
     #[derive(Serialize)]
-    struct Entry {
+    struct Entry<'a> {
         name: &'static str,
         cat: &'static str,
         ph: &'static str,
         ts: f64,
         pid: u64,
         tid: u64,
-        args: Option<Args>,
+        args: Option<Args<'a>>,
     }
 
     #[derive(Serialize)]
-    struct Args {
+    struct Args<'a> {
         file: String,
         line: u32,
+        #[serde(skip_serializing_if = "Option::is_none")]
+        function_name: Option<&'a str>,
+        #[serde(skip_serializing_if = "Option::is_none")]
+        callsite_file: Option<String>,
+        #[serde(skip_serializing_if = "Option::is_none")]
+        callsite_line: Option<u32>,
     }
 
     let lock = EVENTS.lock();
@@ -128,7 +134,21 @@ pub fn export_json<W: Write>(
             ts: event.timestamp.micros_since(events[0].timestamp),
             pid: 1,
             tid: event.thread_id,
-            args: event.span.map(&mut source).map(|(file, line)| Args { file, line }),
+            args: event.span.map(&mut source).map(|(file, line)| {
+                let (callsite_file, callsite_line) = match event.callsite.map(&mut source)
+                {
+                    Some((a, b)) => (Some(a), Some(b)),
+                    None => (None, None),
+                };
+
+                Args {
+                    file,
+                    line,
+                    callsite_file,
+                    callsite_line,
+                    function_name: event.func.as_deref(),
+                }
+            }),
         })
         .map_err(|e| format!("failed to serialize event: {e}"))?;
     }
@@ -142,6 +162,8 @@ pub fn export_json<W: Write>(
 pub struct TimingScope {
     name: &'static str,
     span: Option<NonZeroU64>,
+    callsite: Option<NonZeroU64>,
+    func: Option<String>,
     thread_id: u64,
 }
 
@@ -159,14 +181,34 @@ impl TimingScope {
     /// `typst-timing`).
     #[inline]
     pub fn with_span(name: &'static str, span: Option<NonZeroU64>) -> Option<Self> {
+        Self::with_callsite(name, span, None, None)
+    }
+
+    /// Create a new scope with a span if timing is enabled.
+    ///
+    /// The span is a raw number because `typst-timing` can't depend on
+    /// `typst-syntax` (or else `typst-syntax` couldn't depend on
+    /// `typst-timing`).
+    #[inline]
+    pub fn with_callsite(
+        name: &'static str,
+        span: Option<NonZeroU64>,
+        callsite: Option<NonZeroU64>,
+        func: Option<String>,
+    ) -> Option<Self> {
         if is_enabled() {
-            return Some(Self::new_impl(name, span));
+            return Some(Self::new_impl(name, span, callsite, func));
         }
         None
     }
 
     /// Create a new scope without checking if timing is enabled.
-    fn new_impl(name: &'static str, span: Option<NonZeroU64>) -> Self {
+    fn new_impl(
+        name: &'static str,
+        span: Option<NonZeroU64>,
+        callsite: Option<NonZeroU64>,
+        func: Option<String>,
+    ) -> Self {
         let (thread_id, timestamp) =
             THREAD_DATA.with(|data| (data.id, Timestamp::now_with(data)));
         EVENTS.lock().push(Event {
@@ -174,9 +216,11 @@ impl TimingScope {
             timestamp,
             name,
             span,
+            callsite,
+            func: func.clone(),
             thread_id,
         });
-        Self { name, span, thread_id }
+        Self { name, span, callsite: None, thread_id, func }
     }
 }
 
@@ -188,7 +232,9 @@ impl Drop for TimingScope {
             timestamp,
             name: self.name,
             span: self.span,
+            callsite: self.callsite,
             thread_id: self.thread_id,
+            func: std::mem::take(&mut self.func),
         });
     }
 }
@@ -203,6 +249,10 @@ struct Event {
     name: &'static str,
     /// The raw value of the span of code that this event was recorded in.
     span: Option<NonZeroU64>,
+    /// The raw value of the callsite span of the code that this event was recorded in.
+    callsite: Option<NonZeroU64>,
+    /// The function being called (if any).
+    func: Option<String>,
     /// The thread ID of this event.
     thread_id: u64,
 }