diff --git a/ext/fs/ops.rs b/ext/fs/ops.rs
index 15711e227d..289c3de72a 100644
--- a/ext/fs/ops.rs
+++ b/ext/fs/ops.rs
@@ -371,11 +371,11 @@ where
   Ok(())
 }
 
-#[op]
+#[op2(fast)]
 pub fn op_fs_stat_sync<P>(
   state: &mut OpState,
-  path: String,
-  stat_out_buf: &mut [u32],
+  #[string] path: String,
+  #[buffer] stat_out_buf: &mut [u32],
 ) -> Result<(), AnyError>
 where
   P: FsPermissions + 'static,
@@ -414,11 +414,11 @@ where
   Ok(SerializableStat::from(stat))
 }
 
-#[op]
+#[op2(fast)]
 pub fn op_fs_lstat_sync<P>(
   state: &mut OpState,
-  path: String,
-  stat_out_buf: &mut [u32],
+  #[string] path: String,
+  #[buffer] stat_out_buf: &mut [u32],
 ) -> Result<(), AnyError>
 where
   P: FsPermissions + 'static,
@@ -1123,16 +1123,17 @@ where
   Ok(())
 }
 
-#[op]
+#[op2(async)]
+#[allow(clippy::too_many_arguments)]
 pub async fn op_fs_write_file_async<P>(
   state: Rc<RefCell<OpState>>,
-  path: String,
-  mode: Option<u32>,
+  #[string] path: String,
+  #[smi] mode: Option<u32>,
   append: bool,
   create: bool,
   create_new: bool,
-  data: JsBuffer,
-  cancel_rid: Option<ResourceId>,
+  #[buffer] data: JsBuffer,
+  #[smi] cancel_rid: Option<ResourceId>,
 ) -> Result<(), AnyError>
 where
   P: FsPermissions + 'static,
@@ -1189,11 +1190,12 @@ where
   Ok(buf.into())
 }
 
-#[op]
+#[op2(async)]
+#[serde]
 pub async fn op_fs_read_file_async<P>(
   state: Rc<RefCell<OpState>>,
-  path: String,
-  cancel_rid: Option<ResourceId>,
+  #[string] path: String,
+  #[smi] cancel_rid: Option<ResourceId>,
 ) -> Result<ToJsBuffer, AnyError>
 where
   P: FsPermissions + 'static,
@@ -1228,10 +1230,11 @@ where
   Ok(buf.into())
 }
 
-#[op]
+#[op2]
+#[string]
 pub fn op_fs_read_file_text_sync<P>(
   state: &mut OpState,
-  path: String,
+  #[string] path: String,
 ) -> Result<String, AnyError>
 where
   P: FsPermissions + 'static,
@@ -1247,11 +1250,12 @@ where
   Ok(string_from_utf8_lossy(buf))
 }
 
-#[op]
+#[op2(async)]
+#[string]
 pub async fn op_fs_read_file_text_async<P>(
   state: Rc<RefCell<OpState>>,
-  path: String,
-  cancel_rid: Option<ResourceId>,
+  #[string] path: String,
+  #[smi] cancel_rid: Option<ResourceId>,
 ) -> Result<String, AnyError>
 where
   P: FsPermissions + 'static,
@@ -1375,11 +1379,11 @@ pub async fn op_fs_fsync_async(
   Ok(())
 }
 
-#[op]
+#[op2(fast)]
 pub fn op_fs_fstat_sync(
   state: &mut OpState,
-  rid: ResourceId,
-  stat_out_buf: &mut [u32],
+  #[smi] rid: ResourceId,
+  #[buffer] stat_out_buf: &mut [u32],
 ) -> Result<(), AnyError> {
   let file = FileResource::get_file(state, rid)?;
   let stat = file.stat_sync()?;
diff --git a/ext/http/http_next.rs b/ext/http/http_next.rs
index c6e3ac3841..08d3f54b11 100644
--- a/ext/http/http_next.rs
+++ b/ext/http/http_next.rs
@@ -25,7 +25,6 @@ use deno_core::error::AnyError;
 use deno_core::futures::TryFutureExt;
 use deno_core::op;
 use deno_core::op2;
-use deno_core::serde_v8;
 use deno_core::serde_v8::from_v8;
 use deno_core::unsync::spawn;
 use deno_core::unsync::JoinHandle;
@@ -229,11 +228,11 @@ pub fn op_http_set_promise_complete(#[smi] slab_id: SlabId, status: u16) {
   http.complete();
 }
 
-#[op(v8)]
+#[op2]
 pub fn op_http_get_request_method_and_url<'scope, HTTP>(
   scope: &mut v8::HandleScope<'scope>,
-  slab_id: SlabId,
-) -> serde_v8::Value<'scope>
+  #[smi] slab_id: SlabId,
+) -> v8::Local<'scope, v8::Array>
 where
   HTTP: HttpPropertyExtractor,
 {
@@ -290,10 +289,7 @@ where
   };
 
   let vec = [method, authority, path, peer_address, port];
-  let array = v8::Array::new_with_elements(scope, vec.as_slice());
-  let array_value: v8::Local<v8::Value> = array.into();
-
-  array_value.into()
+  v8::Array::new_with_elements(scope, vec.as_slice())
 }
 
 #[op2]
@@ -307,11 +303,11 @@ pub fn op_http_get_request_header(
   value.map(|value| value.as_bytes().into())
 }
 
-#[op(v8)]
+#[op2]
 pub fn op_http_get_request_headers<'scope>(
   scope: &mut v8::HandleScope<'scope>,
-  slab_id: SlabId,
-) -> serde_v8::Value<'scope> {
+  #[smi] slab_id: SlabId,
+) -> v8::Local<'scope, v8::Array> {
   let http = slab_get(slab_id);
   let headers = &http.request_parts().headers;
   // Two slots for each header key/value pair
@@ -372,16 +368,14 @@ pub fn op_http_get_request_headers<'scope>(
     );
   }
 
-  let array = v8::Array::new_with_elements(scope, vec.as_slice());
-  let array_value: v8::Local<v8::Value> = array.into();
-
-  array_value.into()
+  v8::Array::new_with_elements(scope, vec.as_slice())
 }
 
-#[op(fast)]
+#[op2(fast)]
+#[smi]
 pub fn op_http_read_request_body(
   state: Rc<RefCell<OpState>>,
-  slab_id: SlabId,
+  #[smi] slab_id: SlabId,
 ) -> ResourceId {
   let mut http = slab_get(slab_id);
   let rid = if let Some(incoming) = http.take_body() {
diff --git a/ext/napi/lib.rs b/ext/napi/lib.rs
index ada9aa13fb..e897e149d4 100644
--- a/ext/napi/lib.rs
+++ b/ext/napi/lib.rs
@@ -10,9 +10,8 @@ use deno_core::error::type_error;
 use deno_core::error::AnyError;
 use deno_core::futures::channel::mpsc;
 use deno_core::futures::StreamExt;
-use deno_core::op;
+use deno_core::op2;
 use deno_core::parking_lot::Mutex;
-use deno_core::serde_v8;
 use deno_core::OpState;
 use std::cell::RefCell;
 use std::ffi::CString;
@@ -536,13 +535,13 @@ pub unsafe fn weak_local(
   value
 }
 
-#[op(v8)]
+#[op2]
 fn op_napi_open<NP, 'scope>(
   scope: &mut v8::HandleScope<'scope>,
   op_state: &mut OpState,
-  path: String,
-  global: serde_v8::Value,
-) -> std::result::Result<serde_v8::Value<'scope>, AnyError>
+  #[string] path: String,
+  global: v8::Local<'scope, v8::Value>,
+) -> std::result::Result<v8::Local<'scope, v8::Value>, AnyError>
 where
   NP: NapiPermissions + 'static,
 {
@@ -582,7 +581,7 @@ where
   let mut env = Env::new(
     isolate_ptr,
     v8::Global::new(scope, ctx),
-    v8::Global::new(scope, global.v8_value),
+    v8::Global::new(scope, global),
     async_work_sender,
     tsfn_sender,
     cleanup_hooks,
@@ -640,7 +639,7 @@ where
     // NAPI addons can't be unloaded, so we're going to "forget" the library
     // object so it lives till the program exit.
     std::mem::forget(library);
-    return Ok(serde_v8::Value { v8_value: exports });
+    return Ok(exports);
   }
 
   // Initializer callback.
@@ -673,5 +672,5 @@ where
   // NAPI addons can't be unloaded, so we're going to "forget" the library
   // object so it lives till the program exit.
   std::mem::forget(library);
-  Ok(serde_v8::Value { v8_value: exports })
+  Ok(exports)
 }