From 9ca92dd892ea4cc17a778b966af78fdd28674e76 Mon Sep 17 00:00:00 2001
From: Trashtalk <trashtalk217@gmail.com>
Date: Sat, 2 May 2026 15:13:46 +0200
Subject: [PATCH] store resources on sparse sets

---
 benches/benches/bevy_ecs/main.rs        |  2 +
 benches/benches/bevy_ecs/resources.rs   | 69 +++++++++++++++++++++++++
 crates/bevy_ecs/macros/src/component.rs |  2 +-
 3 files changed, 72 insertions(+), 1 deletion(-)
 create mode 100644 benches/benches/bevy_ecs/resources.rs

diff --git a/benches/benches/bevy_ecs/main.rs b/benches/benches/bevy_ecs/main.rs
index 9e59d31aca00c..ec3447549f0cb 100644
--- a/benches/benches/bevy_ecs/main.rs
+++ b/benches/benches/bevy_ecs/main.rs
@@ -15,6 +15,7 @@ mod fragmentation;
 mod iteration;
 mod observers;
 mod param;
+mod resources;
 mod scheduling;
 mod world;
 
@@ -28,6 +29,7 @@ criterion_main!(
     iteration::benches,
     fragmentation::benches,
     observers::benches,
+    resources::benches,
     scheduling::benches,
     world::benches,
     param::benches,
diff --git a/benches/benches/bevy_ecs/resources.rs b/benches/benches/bevy_ecs/resources.rs
new file mode 100644
index 0000000000000..736e5daaeeb50
--- /dev/null
+++ b/benches/benches/bevy_ecs/resources.rs
@@ -0,0 +1,69 @@
+use std::{alloc::Layout, hint::black_box, ptr::NonNull};
+
+use benches::bench;
+use bevy_ecs::{
+    change_detection::MaybeLocation,
+    component::{ComponentCloneBehavior, ComponentDescriptor, StorageType},
+    prelude::*,
+    ptr::OwningPtr,
+};
+use criterion::{criterion_group, Criterion};
+
+criterion_group!(benches, get, get_mut, insert_remove);
+
+fn create_world() -> World {
+    let mut world = World::new();
+    for _ in 0..500 {
+        // SAFETY: Uses zero-sized value, never drops
+        unsafe {
+            let resource_id =
+                world.register_component_with_descriptor(ComponentDescriptor::new_with_layout(
+                    "",
+                    StorageType::SparseSet,
+                    Layout::new::<()>(),
+                    None,
+                    true,
+                    ComponentCloneBehavior::Default,
+                    None,
+                ));
+            world.insert_resource_by_id(
+                resource_id,
+                OwningPtr::new(NonNull::dangling()),
+                MaybeLocation::caller(),
+            );
+        }
+    }
+    world
+}
+
+#[derive(Resource)]
+struct R;
+
+pub fn get(criterion: &mut Criterion) {
+    let mut world = create_world();
+    world.insert_resource(R);
+    criterion.bench_function(bench!("get"), |bencher| {
+        bencher.iter(|| world.get_resource::<R>());
+    });
+}
+
+pub fn get_mut(criterion: &mut Criterion) {
+    let mut world = create_world();
+    world.insert_resource(R);
+    criterion.bench_function(bench!("get_mut"), |bencher| {
+        bencher.iter(|| {
+            black_box(world.get_resource_mut::<R>());
+        });
+    });
+}
+
+pub fn insert_remove(criterion: &mut Criterion) {
+    let mut world = create_world();
+    criterion.bench_function(bench!("insert_remove"), |bencher| {
+        bencher.iter(|| {
+            world.insert_resource(R);
+            black_box(&mut world);
+            world.remove_resource::<R>()
+        });
+    });
+}
diff --git a/crates/bevy_ecs/macros/src/component.rs b/crates/bevy_ecs/macros/src/component.rs
index 66e9244f44c68..142aea76ba8c7 100644
--- a/crates/bevy_ecs/macros/src/component.rs
+++ b/crates/bevy_ecs/macros/src/component.rs
@@ -47,7 +47,7 @@ pub fn derive_resource(input: TokenStream) -> TokenStream {
         }
     });
 
-    let storage = storage_path(&bevy_ecs_path, StorageTy::Table);
+    let storage = storage_path(&bevy_ecs_path, StorageTy::SparseSet);
 
     ast.generics
         .make_where_clause()