diff --git a/core/src/primitive/layer.rs b/core/src/primitive/layer.rs
index 3fb2411..1329d70 100644
--- a/core/src/primitive/layer.rs
+++ b/core/src/primitive/layer.rs
@@ -120,6 +120,10 @@ impl<T: Default> Layers<T> {
 }
 
 impl DrawLayers {
+    /// Inlined on purpose: it is one call per glyph, the innermost thing a
+    /// frame does, and whether the inliner takes it turns out to depend on
+    /// unrelated code elsewhere in the crate -- 12% of a resize frame.
+    #[inline]
     pub fn write<P: Primitive>(
         &mut self,
         layer: LayerId,