diff --git a/Cargo.lock b/Cargo.lock
index 8ad49068fa..8c94f84792 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -4135,7 +4135,7 @@ dependencies = [
 [[package]]
 name = "create-output-dir"
 version = "1.0.0"
-source = "git+https://github.com/dojoengine/scarb?rev=b5ab351aa9b52dcf27a397021d84a423afd016dc#b5ab351aa9b52dcf27a397021d84a423afd016dc"
+source = "git+https://github.com/dojoengine/scarb?rev=a3b3c7fae12aecd3ce1502b1a651fced6be546df#a3b3c7fae12aecd3ce1502b1a651fced6be546df"
 dependencies = [
  "anyhow",
  "core-foundation 0.10.0",
@@ -4873,7 +4873,7 @@ dependencies = [
 [[package]]
 name = "dojo-lang"
 version = "1.0.12"
-source = "git+https://github.com/dojoengine/dojo?rev=99bdd37c1aeb6d75028c32d4039916b97cb3a438#99bdd37c1aeb6d75028c32d4039916b97cb3a438"
+source = "git+https://github.com/dojoengine/dojo?rev=d32e89a1035a8cd6abafe2e35b2c640b4d43de38#d32e89a1035a8cd6abafe2e35b2c640b4d43de38"
 dependencies = [
  "anyhow",
  "cairo-lang-defs",
@@ -4883,7 +4883,7 @@ dependencies = [
  "cairo-lang-semantic",
  "cairo-lang-syntax",
  "cairo-lang-utils",
- "dojo-types 1.0.12 (git+https://github.com/dojoengine/dojo?rev=99bdd37c1aeb6d75028c32d4039916b97cb3a438)",
+ "dojo-types 1.0.12 (git+https://github.com/dojoengine/dojo?rev=d32e89a1035a8cd6abafe2e35b2c640b4d43de38)",
  "itertools 0.12.1",
  "serde",
  "smol_str",
@@ -4965,7 +4965,7 @@ dependencies = [
 [[package]]
 name = "dojo-types"
 version = "1.0.12"
-source = "git+https://github.com/dojoengine/dojo?rev=99bdd37c1aeb6d75028c32d4039916b97cb3a438#99bdd37c1aeb6d75028c32d4039916b97cb3a438"
+source = "git+https://github.com/dojoengine/dojo?rev=d32e89a1035a8cd6abafe2e35b2c640b4d43de38#d32e89a1035a8cd6abafe2e35b2c640b4d43de38"
 dependencies = [
  "anyhow",
  "cainome 0.4.11",
@@ -13182,7 +13182,7 @@ dependencies = [
 [[package]]
 name = "scarb"
 version = "2.9.2"
-source = "git+https://github.com/dojoengine/scarb?rev=b5ab351aa9b52dcf27a397021d84a423afd016dc#b5ab351aa9b52dcf27a397021d84a423afd016dc"
+source = "git+https://github.com/dojoengine/scarb?rev=a3b3c7fae12aecd3ce1502b1a651fced6be546df#a3b3c7fae12aecd3ce1502b1a651fced6be546df"
 dependencies = [
  "anyhow",
  "async-trait",
@@ -13214,7 +13214,7 @@ dependencies = [
  "derive_builder",
  "dialoguer",
  "directories",
- "dojo-lang 1.0.12 (git+https://github.com/dojoengine/dojo?rev=99bdd37c1aeb6d75028c32d4039916b97cb3a438)",
+ "dojo-lang 1.0.12 (git+https://github.com/dojoengine/dojo?rev=d32e89a1035a8cd6abafe2e35b2c640b4d43de38)",
  "dunce",
  "flate2",
  "fs4",
@@ -13235,9 +13235,9 @@ dependencies = [
  "redb",
  "reqwest 0.11.27",
  "scarb-build-metadata",
- "scarb-metadata 1.13.0 (git+https://github.com/dojoengine/scarb?rev=b5ab351aa9b52dcf27a397021d84a423afd016dc)",
- "scarb-proc-macro-server-types 0.1.0 (git+https://github.com/dojoengine/scarb?rev=b5ab351aa9b52dcf27a397021d84a423afd016dc)",
- "scarb-stable-hash 1.0.0 (git+https://github.com/dojoengine/scarb?rev=b5ab351aa9b52dcf27a397021d84a423afd016dc)",
+ "scarb-metadata 1.13.0 (git+https://github.com/dojoengine/scarb?rev=a3b3c7fae12aecd3ce1502b1a651fced6be546df)",
+ "scarb-proc-macro-server-types 0.1.0 (git+https://github.com/dojoengine/scarb?rev=a3b3c7fae12aecd3ce1502b1a651fced6be546df)",
+ "scarb-stable-hash 1.0.0 (git+https://github.com/dojoengine/scarb?rev=a3b3c7fae12aecd3ce1502b1a651fced6be546df)",
  "scarb-ui",
  "semver 1.0.23",
  "serde",
@@ -13267,7 +13267,7 @@ dependencies = [
 [[package]]
 name = "scarb-build-metadata"
 version = "2.9.2"
-source = "git+https://github.com/dojoengine/scarb?rev=b5ab351aa9b52dcf27a397021d84a423afd016dc#b5ab351aa9b52dcf27a397021d84a423afd016dc"
+source = "git+https://github.com/dojoengine/scarb?rev=a3b3c7fae12aecd3ce1502b1a651fced6be546df#a3b3c7fae12aecd3ce1502b1a651fced6be546df"
 dependencies = [
  "cargo_metadata",
 ]
@@ -13288,7 +13288,7 @@ dependencies = [
 [[package]]
 name = "scarb-metadata"
 version = "1.13.0"
-source = "git+https://github.com/dojoengine/scarb?rev=b5ab351aa9b52dcf27a397021d84a423afd016dc#b5ab351aa9b52dcf27a397021d84a423afd016dc"
+source = "git+https://github.com/dojoengine/scarb?rev=a3b3c7fae12aecd3ce1502b1a651fced6be546df#a3b3c7fae12aecd3ce1502b1a651fced6be546df"
 dependencies = [
  "camino",
  "derive_builder",
@@ -13312,7 +13312,7 @@ dependencies = [
 [[package]]
 name = "scarb-proc-macro-server-types"
 version = "0.1.0"
-source = "git+https://github.com/dojoengine/scarb?rev=b5ab351aa9b52dcf27a397021d84a423afd016dc#b5ab351aa9b52dcf27a397021d84a423afd016dc"
+source = "git+https://github.com/dojoengine/scarb?rev=a3b3c7fae12aecd3ce1502b1a651fced6be546df#a3b3c7fae12aecd3ce1502b1a651fced6be546df"
 dependencies = [
  "cairo-lang-macro",
  "serde",
@@ -13332,7 +13332,7 @@ dependencies = [
 [[package]]
 name = "scarb-stable-hash"
 version = "1.0.0"
-source = "git+https://github.com/dojoengine/scarb?rev=b5ab351aa9b52dcf27a397021d84a423afd016dc#b5ab351aa9b52dcf27a397021d84a423afd016dc"
+source = "git+https://github.com/dojoengine/scarb?rev=a3b3c7fae12aecd3ce1502b1a651fced6be546df#a3b3c7fae12aecd3ce1502b1a651fced6be546df"
 dependencies = [
  "data-encoding",
  "xxhash-rust",
@@ -13341,14 +13341,14 @@ dependencies = [
 [[package]]
 name = "scarb-ui"
 version = "0.1.5"
-source = "git+https://github.com/dojoengine/scarb?rev=b5ab351aa9b52dcf27a397021d84a423afd016dc#b5ab351aa9b52dcf27a397021d84a423afd016dc"
+source = "git+https://github.com/dojoengine/scarb?rev=a3b3c7fae12aecd3ce1502b1a651fced6be546df#a3b3c7fae12aecd3ce1502b1a651fced6be546df"
 dependencies = [
  "anyhow",
  "camino",
  "clap",
  "console",
  "indicatif",
- "scarb-metadata 1.13.0 (git+https://github.com/dojoengine/scarb?rev=b5ab351aa9b52dcf27a397021d84a423afd016dc)",
+ "scarb-metadata 1.13.0 (git+https://github.com/dojoengine/scarb?rev=a3b3c7fae12aecd3ce1502b1a651fced6be546df)",
  "serde",
  "serde_json",
  "tracing-core",
@@ -14136,7 +14136,7 @@ dependencies = [
  "notify",
  "reqwest 0.11.27",
  "scarb",
- "scarb-metadata 1.13.0 (git+https://github.com/dojoengine/scarb?rev=b5ab351aa9b52dcf27a397021d84a423afd016dc)",
+ "scarb-metadata 1.13.0 (git+https://github.com/dojoengine/scarb?rev=a3b3c7fae12aecd3ce1502b1a651fced6be546df)",
  "scarb-ui",
  "semver 1.0.23",
  "serde",
diff --git a/Cargo.toml b/Cargo.toml
index 7ad37a4bdb..19bb4397e0 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -214,9 +214,9 @@ rpassword = "7.2.0"
 rstest = "0.18.2"
 rstest_reuse = "0.6.0"
 salsa = "0.16.1"
-scarb = { git = "https://github.com/dojoengine/scarb", rev = "b5ab351aa9b52dcf27a397021d84a423afd016dc" }
-scarb-metadata = { git = "https://github.com/dojoengine/scarb", rev = "b5ab351aa9b52dcf27a397021d84a423afd016dc" }
-scarb-ui = { git = "https://github.com/dojoengine/scarb", rev = "b5ab351aa9b52dcf27a397021d84a423afd016dc" }
+scarb = { git = "https://github.com/dojoengine/scarb", rev = "a3b3c7fae12aecd3ce1502b1a651fced6be546df" }
+scarb-metadata = { git = "https://github.com/dojoengine/scarb", rev = "a3b3c7fae12aecd3ce1502b1a651fced6be546df" }
+scarb-ui = { git = "https://github.com/dojoengine/scarb", rev = "a3b3c7fae12aecd3ce1502b1a651fced6be546df" }
 semver = "1.0.5"
 serde = { version = "1.0", features = [ "derive" ] }
 serde_json = { version = "1.0", features = [ "arbitrary_precision" ] }
diff --git a/crates/dojo/core-cairo-test/src/lib.cairo b/crates/dojo/core-cairo-test/src/lib.cairo
index 27259486a3..2963fb10a6 100644
--- a/crates/dojo/core-cairo-test/src/lib.cairo
+++ b/crates/dojo/core-cairo-test/src/lib.cairo
@@ -38,6 +38,7 @@ mod tests {
 
     mod expanded {
         pub(crate) mod selector_attack;
+        pub(crate) mod bytearray_hash;
     }
 
     mod helpers {
diff --git a/crates/dojo/core-cairo-test/src/tests/expanded/bytearray_hash.cairo b/crates/dojo/core-cairo-test/src/tests/expanded/bytearray_hash.cairo
new file mode 100644
index 0000000000..964a208ef7
--- /dev/null
+++ b/crates/dojo/core-cairo-test/src/tests/expanded/bytearray_hash.cairo
@@ -0,0 +1,51 @@
+use core::poseidon::poseidon_hash_span;
+
+#[test]
+fn test_bytearray_hash() {
+    let bytes: ByteArray = "foo";
+    let hash = bytearray_hash!("foo");
+    let mut array = array![];
+    bytes.serialize(ref array);
+    let computed = poseidon_hash_span(array.span());
+    assert_eq!(computed, hash);
+}
+
+#[test]
+fn test_bytearray_hash_empty() {
+    let bytes: ByteArray = "";
+    let hash = bytearray_hash!("");
+    let mut array = array![];
+    bytes.serialize(ref array);
+    let computed = poseidon_hash_span(array.span());
+    assert_eq!(computed, hash);
+}
+
+#[test]
+fn test_bytearray_hash_31() {
+    let bytes: ByteArray = "0123456789012345678901234567890";
+    let hash = bytearray_hash!("0123456789012345678901234567890");
+    let mut array = array![];
+    bytes.serialize(ref array);
+    let computed = poseidon_hash_span(array.span());
+    assert_eq!(computed, hash);
+}
+
+#[test]
+fn test_bytearray_hash_long() {
+    let bytes: ByteArray = "0123456789012345678901234567890foo";
+    let hash = bytearray_hash!("0123456789012345678901234567890foo");
+    let mut array = array![];
+    bytes.serialize(ref array);
+    let computed = poseidon_hash_span(array.span());
+    assert_eq!(computed, hash);
+}
+
+#[test]
+fn test_bytearray_hash_ne() {
+    let bytes: ByteArray = "foo";
+    let hash = bytearray_hash!("bar");
+    let mut array = array![];
+    bytes.serialize(ref array);
+    let computed = poseidon_hash_span(array.span());
+    assert_ne!(computed, hash);
+}
diff --git a/crates/dojo/core/src/lib.cairo b/crates/dojo/core/src/lib.cairo
index 67b2dc9290..8a8fc4a6b7 100644
--- a/crates/dojo/core/src/lib.cairo
+++ b/crates/dojo/core/src/lib.cairo
@@ -67,7 +67,9 @@ pub mod storage {
 
 pub mod utils {
     pub mod hash;
-    pub use hash::{bytearray_hash, selector_from_names, selector_from_namespace_and_name};
+    pub use hash::{
+        bytearray_hash, selector_from_hashes, selector_from_names, selector_from_namespace_and_name,
+    };
 
     pub mod key;
     pub use key::{entity_id_from_serialized_keys, combine_key, entity_id_from_keys};
diff --git a/crates/dojo/core/src/utils/hash.cairo b/crates/dojo/core/src/utils/hash.cairo
index d356c6f88c..e09a453a6e 100644
--- a/crates/dojo/core/src/utils/hash.cairo
+++ b/crates/dojo/core/src/utils/hash.cairo
@@ -17,3 +17,8 @@ pub fn selector_from_names(namespace: @ByteArray, name: @ByteArray) -> felt252 {
 pub fn selector_from_namespace_and_name(namespace_hash: felt252, name: @ByteArray) -> felt252 {
     poseidon_hash_span([namespace_hash, bytearray_hash(name)].span())
 }
+
+/// Computes the selector from two hashes.
+pub fn selector_from_hashes(namespace_hash: felt252, name_hash: felt252) -> felt252 {
+    poseidon_hash_span([namespace_hash, name_hash].span())
+}
diff --git a/crates/dojo/core/src/world/storage.cairo b/crates/dojo/core/src/world/storage.cairo
index b813a6325a..25cb2ebec8 100644
--- a/crates/dojo/core/src/world/storage.cairo
+++ b/crates/dojo/core/src/world/storage.cairo
@@ -32,15 +32,30 @@ pub impl WorldStorageInternalImpl of WorldStorageTrait {
         WorldStorage { dispatcher: world, namespace_hash }
     }
 
+    fn new_from_hash(world: IWorldDispatcher, namespace_hash: felt252) -> WorldStorage {
+        WorldStorage { dispatcher: world, namespace_hash }
+    }
+
     fn set_namespace(ref self: WorldStorage, namespace: @ByteArray) {
         self.namespace_hash = dojo::utils::bytearray_hash(namespace);
     }
 
     fn dns(self: @WorldStorage, contract_name: @ByteArray) -> Option<(ContractAddress, ClassHash)> {
-        match (*self.dispatcher)
-            .resource(
-                dojo::utils::selector_from_namespace_and_name(*self.namespace_hash, contract_name),
-            ) {
+        Self::dns_from_hash(self, dojo::utils::bytearray_hash(contract_name))
+    }
+
+    fn dns_from_hash(
+        self: @WorldStorage, contract_name_hash: felt252,
+    ) -> Option<(ContractAddress, ClassHash)> {
+        Self::dns_from_selector(
+            self, dojo::utils::selector_from_hashes(*self.namespace_hash, contract_name_hash),
+        )
+    }
+
+    fn dns_from_selector(
+        self: @WorldStorage, selector: felt252,
+    ) -> Option<(ContractAddress, ClassHash)> {
+        match (*self.dispatcher).resource(selector) {
             Resource::Contract((
                 contract_address, _,
             )) => {
diff --git a/crates/dojo/lang/src/attribute_macros/patches/contract.patch.cairo b/crates/dojo/lang/src/attribute_macros/patches/contract.patch.cairo
index 46ee7353b1..18d2308b28 100644
--- a/crates/dojo/lang/src/attribute_macros/patches/contract.patch.cairo
+++ b/crates/dojo/lang/src/attribute_macros/patches/contract.patch.cairo
@@ -29,6 +29,10 @@ pub mod $name$ {
         fn world(self: @ContractState, namespace: @ByteArray) -> dojo::world::storage::WorldStorage {
             dojo::world::WorldStorageTrait::new(self.world_provider.world_dispatcher(), namespace)
         }
+
+        fn world_ns_hash(self: @ContractState, namespace_hash: felt252) -> dojo::world::storage::WorldStorage {
+            dojo::world::WorldStorageTrait::new_from_hash(self.world_provider.world_dispatcher(), namespace_hash)
+        }
     }
 
     $body$
diff --git a/crates/dojo/lang/src/cairo_plugin.rs b/crates/dojo/lang/src/cairo_plugin.rs
index a13cc76533..69ce6b4360 100644
--- a/crates/dojo/lang/src/cairo_plugin.rs
+++ b/crates/dojo/lang/src/cairo_plugin.rs
@@ -12,7 +12,7 @@ use super::attribute_macros::{
     DojoContract, DojoEvent, DojoModel, DOJO_CONTRACT_ATTR, DOJO_EVENT_ATTR, DOJO_MODEL_ATTR,
 };
 use super::derive_macros::{dojo_derive_all, DOJO_INTROSPECT_DERIVE, DOJO_PACKED_DERIVE};
-use super::inline_macros::SelectorFromTagMacro;
+use super::inline_macros::{BytearrayHashMacro, SelectorFromTagMacro};
 
 // #[cfg(test)]
 // #[path = "plugin_test.rs"]
@@ -25,7 +25,10 @@ pub struct BuiltinDojoPlugin;
 pub fn dojo_plugin_suite() -> PluginSuite {
     let mut suite = PluginSuite::default();
 
-    suite.add_plugin::<BuiltinDojoPlugin>().add_inline_macro_plugin::<SelectorFromTagMacro>();
+    suite
+        .add_plugin::<BuiltinDojoPlugin>()
+        .add_inline_macro_plugin::<SelectorFromTagMacro>()
+        .add_inline_macro_plugin::<BytearrayHashMacro>();
 
     suite
 }
diff --git a/crates/dojo/lang/src/inline_macros/bytearray_hash.rs b/crates/dojo/lang/src/inline_macros/bytearray_hash.rs
new file mode 100644
index 0000000000..46435f6011
--- /dev/null
+++ b/crates/dojo/lang/src/inline_macros/bytearray_hash.rs
@@ -0,0 +1,63 @@
+use cairo_lang_defs::patcher::PatchBuilder;
+use cairo_lang_defs::plugin::{
+    InlineMacroExprPlugin, InlinePluginResult, MacroPluginMetadata, NamedPlugin, PluginDiagnostic,
+    PluginGeneratedFile,
+};
+use cairo_lang_defs::plugin_utils::unsupported_bracket_diagnostic;
+use cairo_lang_diagnostics::Severity;
+use cairo_lang_syntax::node::{ast, TypedStablePtr, TypedSyntaxNode};
+use dojo_types::naming;
+
+#[derive(Debug, Default)]
+pub struct BytearrayHashMacro;
+
+impl NamedPlugin for BytearrayHashMacro {
+    const NAME: &'static str = "bytearray_hash";
+}
+
+impl InlineMacroExprPlugin for BytearrayHashMacro {
+    fn generate_code(
+        &self,
+        db: &dyn cairo_lang_syntax::node::db::SyntaxGroup,
+        syntax: &ast::ExprInlineMacro,
+        _metadata: &MacroPluginMetadata<'_>,
+    ) -> InlinePluginResult {
+        let ast::WrappedArgList::ParenthesizedArgList(arg_list) = syntax.arguments(db) else {
+            return unsupported_bracket_diagnostic(db, syntax);
+        };
+
+        let args = arg_list.arguments(db).elements(db);
+
+        if args.len() != 1 {
+            return InlinePluginResult {
+                code: None,
+                diagnostics: vec![PluginDiagnostic {
+                    stable_ptr: syntax.stable_ptr().untyped(),
+                    message: "Invalid arguments. Expected \"bytearray_hash!(\"long string\")\""
+                        .to_string(),
+                    severity: Severity::Error,
+                }],
+            };
+        }
+
+        let bytearray = &args[0].as_syntax_node().get_text(db).replace('\"', "");
+
+        let bytearray_hash = naming::compute_bytearray_hash(bytearray);
+
+        let mut builder = PatchBuilder::new(db, syntax);
+        builder.add_str(&format!("{:#64x}", bytearray_hash));
+
+        let (code, code_mappings) = builder.build();
+
+        InlinePluginResult {
+            code: Some(PluginGeneratedFile {
+                name: "bytearray_hash_macro".into(),
+                content: code,
+                code_mappings,
+                diagnostics_note: None,
+                aux_data: None,
+            }),
+            diagnostics: vec![],
+        }
+    }
+}
diff --git a/crates/dojo/lang/src/inline_macros/mod.rs b/crates/dojo/lang/src/inline_macros/mod.rs
index 1f28612be1..e65f3659d6 100644
--- a/crates/dojo/lang/src/inline_macros/mod.rs
+++ b/crates/dojo/lang/src/inline_macros/mod.rs
@@ -8,6 +8,7 @@ use cairo_lang_syntax::node::db::SyntaxGroup;
 use cairo_lang_syntax::node::{ast, Terminal, TypedStablePtr, TypedSyntaxNode};
 use smol_str::SmolStr;
 
+pub mod bytearray_hash;
 pub mod delete;
 pub mod emit;
 pub mod get;
@@ -17,6 +18,7 @@ pub mod set;
 pub mod spawn_test_world;
 pub mod utils;
 
+pub use bytearray_hash::BytearrayHashMacro;
 pub use delete::DeleteMacro;
 pub use emit::EmitMacro;
 pub use get::GetMacro;
diff --git a/examples/spawn-and-move/src/actions.cairo b/examples/spawn-and-move/src/actions.cairo
index 352a4ae18d..4683eddb37 100644
--- a/examples/spawn-and-move/src/actions.cairo
+++ b/examples/spawn-and-move/src/actions.cairo
@@ -215,13 +215,19 @@ pub mod actions {
         fn world_default(self: @ContractState) -> dojo::world::WorldStorage {
             self.world(@"ns")
         }
+
+        /// A gas optimized version of `world_default`, where hash is computed at compile time.
+        /// Can make a difference if switching between namespaces is frequent.
+        fn world_default_ns_hash(self: @ContractState) -> dojo::world::WorldStorage {
+            self.world_ns_hash(bytearray_hash!("ns"))
+        }
     }
 }
 
 #[cfg(test)]
 mod tests {
     use dojo::model::{ModelStorage, ModelValueStorage, ModelStorageTest};
-    use dojo::world::WorldStorageTrait;
+    use dojo::world::{WorldStorageTrait};
     use dojo_cairo_test::{
         spawn_test_world, NamespaceDef, TestResource, ContractDefTrait, ContractDef,
         WorldStorageTestTrait,
@@ -323,6 +329,18 @@ mod tests {
         assert(new_position.vec.y == initial_position.vec.y, 'position y is wrong');
     }
 
+    #[test]
+    #[available_gas(30000000)]
+    fn test_world_from_hash() {
+        let ndef = namespace_def();
+        let mut world = spawn_test_world([ndef].span());
+        world.sync_perms_and_inits(contract_defs());
+        let hash: felt252 = bytearray_hash!("ns");
+        let storage = dojo::world::WorldStorageTrait::new_from_hash(world.dispatcher, hash);
+        assert_eq!(storage.namespace_hash, world.namespace_hash);
+        assert_eq!(storage.dispatcher.contract_address, world.dispatcher.contract_address);
+    }
+
     #[test]
     #[available_gas(30000000)]
     #[cfg(feature: 'dungeon')]
diff --git a/spawn-and-move-db.tar.gz b/spawn-and-move-db.tar.gz
index 20dcfbeb51..b8309c9feb 100644
Binary files a/spawn-and-move-db.tar.gz and b/spawn-and-move-db.tar.gz differ
diff --git a/types-test-db.tar.gz b/types-test-db.tar.gz
index c5c1b3f889..afd4fc8309 100644
Binary files a/types-test-db.tar.gz and b/types-test-db.tar.gz differ