diff --git a/examples/call_between_rust_and_python.rs b/examples/call_between_rust_and_python.rs
index 576390d059..80bf65526a 100644
--- a/examples/call_between_rust_and_python.rs
+++ b/examples/call_between_rust_and_python.rs
@@ -31,7 +31,7 @@ pub fn main() {
 #[pymodule]
 mod rust_py_module {
     use super::*;
-    use rustpython::vm::{PyObjectRef, builtins::PyList, convert::ToPyObject};
+    use rustpython::vm::{PyObjectRef, convert::ToPyObject};
 
     #[pyfunction]
     fn rust_function(
@@ -58,7 +58,7 @@ python_person.name: {}",
     impl ToPyObject for NumVec {
         fn to_pyobject(self, vm: &VirtualMachine) -> PyObjectRef {
             let list = self.0.into_iter().map(|e| vm.new_pyobj(e)).collect();
-            PyList::new_ref(list, vm.as_ref()).to_pyobject(vm)
+            vm.ctx.new_list(list).to_pyobject(vm)
         }
     }
 
diff --git a/vm/src/builtins/bytearray.rs b/vm/src/builtins/bytearray.rs
index 0a13c04dc8..5be976c3a1 100644
--- a/vm/src/builtins/bytearray.rs
+++ b/vm/src/builtins/bytearray.rs
@@ -134,7 +134,7 @@ impl PyByteArray {
             SequenceIndex::Slice(slice) => self
                 .borrow_buf()
                 .getitem_by_slice(vm, slice)
-                .map(|x| Self::new_ref(x, &vm.ctx).into()),
+                .map(|x| vm.ctx.new_bytearray(x).into()),
         }
     }
 
@@ -463,11 +463,8 @@ impl PyByteArray {
         options: ByteInnerSplitOptions,
         vm: &VirtualMachine,
     ) -> PyResult<Vec<PyObjectRef>> {
-        self.inner().split(
-            options,
-            |s, vm| Self::new_ref(s.to_vec(), &vm.ctx).into(),
-            vm,
-        )
+        self.inner()
+            .split(options, |s, vm| vm.ctx.new_bytearray(s.to_vec()).into(), vm)
     }
 
     #[pymethod]
@@ -476,11 +473,8 @@ impl PyByteArray {
         options: ByteInnerSplitOptions,
         vm: &VirtualMachine,
     ) -> PyResult<Vec<PyObjectRef>> {
-        self.inner().rsplit(
-            options,
-            |s, vm| Self::new_ref(s.to_vec(), &vm.ctx).into(),
-            vm,
-        )
+        self.inner()
+            .rsplit(options, |s, vm| vm.ctx.new_bytearray(s.to_vec()).into(), vm)
     }
 
     #[pymethod]
@@ -490,9 +484,10 @@ impl PyByteArray {
         let value = self.inner();
         let (front, has_mid, back) = value.partition(&sep, vm)?;
         Ok(vm.new_tuple((
-            Self::new_ref(front.to_vec(), &vm.ctx),
-            Self::new_ref(if has_mid { sep.elements } else { Vec::new() }, &vm.ctx),
-            Self::new_ref(back.to_vec(), &vm.ctx),
+            vm.ctx.new_bytearray(front.to_vec()),
+            vm.ctx
+                .new_bytearray(if has_mid { sep.elements } else { Vec::new() }),
+            vm.ctx.new_bytearray(back.to_vec()),
         )))
     }
 
@@ -501,9 +496,10 @@ impl PyByteArray {
         let value = self.inner();
         let (back, has_mid, front) = value.rpartition(&sep, vm)?;
         Ok(vm.new_tuple((
-            Self::new_ref(front.to_vec(), &vm.ctx),
-            Self::new_ref(if has_mid { sep.elements } else { Vec::new() }, &vm.ctx),
-            Self::new_ref(back.to_vec(), &vm.ctx),
+            vm.ctx.new_bytearray(front.to_vec()),
+            vm.ctx
+                .new_bytearray(if has_mid { sep.elements } else { Vec::new() }),
+            vm.ctx.new_bytearray(back.to_vec()),
         )))
     }
 
@@ -515,7 +511,7 @@ impl PyByteArray {
     #[pymethod]
     fn splitlines(&self, options: anystr::SplitLinesArgs, vm: &VirtualMachine) -> Vec<PyObjectRef> {
         self.inner()
-            .splitlines(options, |x| Self::new_ref(x.to_vec(), &vm.ctx).into())
+            .splitlines(options, |x| vm.ctx.new_bytearray(x.to_vec()).into())
     }
 
     #[pymethod]
@@ -878,10 +874,6 @@ impl Representable for PyByteArray {
     }
 }
 
-// fn set_value(obj: &PyObject, value: Vec<u8>) {
-//     obj.borrow_mut().kind = PyObjectPayload::Bytes { value };
-// }
-
 #[pyclass(module = false, name = "bytearray_iterator")]
 #[derive(Debug)]
 pub struct PyByteArrayIterator {
diff --git a/vm/src/builtins/classmethod.rs b/vm/src/builtins/classmethod.rs
index 47e115a10c..f48152d503 100644
--- a/vm/src/builtins/classmethod.rs
+++ b/vm/src/builtins/classmethod.rs
@@ -58,7 +58,9 @@ impl GetDescriptor for PyClassMethod {
         let cls = cls.unwrap_or_else(|| _obj.class().to_owned().into());
         let call_descr_get: PyResult<PyObjectRef> = zelf.callable.lock().get_attr("__get__", vm);
         match call_descr_get {
-            Err(_) => Ok(PyBoundMethod::new_ref(cls, zelf.callable.lock().clone(), &vm.ctx).into()),
+            Err(_) => Ok(PyBoundMethod::new(cls, zelf.callable.lock().clone())
+                .into_ref(&vm.ctx)
+                .into()),
             Ok(call_descr_get) => call_descr_get.call((cls.clone(), cls), vm),
         }
     }
diff --git a/vm/src/builtins/complex.rs b/vm/src/builtins/complex.rs
index 88f694e9d1..752d941061 100644
--- a/vm/src/builtins/complex.rs
+++ b/vm/src/builtins/complex.rs
@@ -42,7 +42,7 @@ impl PyPayload for PyComplex {
 
 impl ToPyObject for Complex64 {
     fn to_pyobject(self, vm: &VirtualMachine) -> PyObjectRef {
-        PyComplex::new_ref(self, &vm.ctx).into()
+        PyComplex::from(self).to_pyobject(vm)
     }
 }
 
diff --git a/vm/src/builtins/dict.rs b/vm/src/builtins/dict.rs
index 1130fec606..f9610af5dc 100644
--- a/vm/src/builtins/dict.rs
+++ b/vm/src/builtins/dict.rs
@@ -44,6 +44,7 @@ impl fmt::Debug for PyDict {
 }
 
 impl PyPayload for PyDict {
+    #[inline]
     fn class(ctx: &Context) -> &'static Py<PyType> {
         ctx.types.dict_type
     }
diff --git a/vm/src/builtins/function.rs b/vm/src/builtins/function.rs
index 9dd9daa105..7bcd6bd7b0 100644
--- a/vm/src/builtins/function.rs
+++ b/vm/src/builtins/function.rs
@@ -554,7 +554,7 @@ impl GetDescriptor for PyFunction {
         let obj = if vm.is_none(&obj) && !Self::_cls_is(&cls, obj.class()) {
             zelf
         } else {
-            PyBoundMethod::new_ref(obj, zelf, &vm.ctx).into()
+            PyBoundMethod::new(obj, zelf).into_ref(&vm.ctx).into()
         };
         Ok(obj)
     }
@@ -722,7 +722,7 @@ impl Constructor for PyBoundMethod {
 }
 
 impl PyBoundMethod {
-    fn new(object: PyObjectRef, function: PyObjectRef) -> Self {
+    pub fn new(object: PyObjectRef, function: PyObjectRef) -> Self {
         PyBoundMethod { object, function }
     }
 
diff --git a/vm/src/builtins/list.rs b/vm/src/builtins/list.rs
index fe867ebd75..9cd7ecbe47 100644
--- a/vm/src/builtins/list.rs
+++ b/vm/src/builtins/list.rs
@@ -58,7 +58,7 @@ impl PyPayload for PyList {
 
 impl ToPyObject for Vec<PyObjectRef> {
     fn to_pyobject(self, vm: &VirtualMachine) -> PyObjectRef {
-        PyList::new_ref(self, &vm.ctx).into()
+        PyList::from(self).into_ref(&vm.ctx).into()
     }
 }
 
@@ -78,7 +78,7 @@ impl PyList {
     fn repeat(&self, n: isize, vm: &VirtualMachine) -> PyResult<PyRef<Self>> {
         let elements = &*self.borrow_vec();
         let v = elements.mul(vm, n)?;
-        Ok(Self::new_ref(v, &vm.ctx))
+        Ok(Self::from(v).into_ref(&vm.ctx))
     }
 
     fn irepeat(zelf: PyRef<Self>, n: isize, vm: &VirtualMachine) -> PyResult<PyRef<Self>> {
@@ -140,7 +140,7 @@ impl PyList {
         })?;
         let mut elements = self.borrow_vec().to_vec();
         elements.extend(other.borrow_vec().iter().cloned());
-        Ok(Self::new_ref(elements, &vm.ctx))
+        Ok(Self::from(elements).into_ref(&vm.ctx))
     }
 
     #[pymethod]
@@ -176,7 +176,7 @@ impl PyList {
 
     #[pymethod]
     fn copy(&self, vm: &VirtualMachine) -> PyRef<Self> {
-        Self::new_ref(self.borrow_vec().to_vec(), &vm.ctx)
+        Self::from(self.borrow_vec().to_vec()).into_ref(&vm.ctx)
     }
 
     #[allow(clippy::len_without_is_empty)]
diff --git a/vm/src/bytes_inner.rs b/vm/src/bytes_inner.rs
index fef9e67b56..8f189ee35e 100644
--- a/vm/src/bytes_inner.rs
+++ b/vm/src/bytes_inner.rs
@@ -96,7 +96,7 @@ impl ByteInnerNewOptions {
             (OptionalArg::Present(obj), OptionalArg::Missing, OptionalArg::Missing) => {
                 let obj = obj.clone();
                 // construct an exact bytes from an exact bytes do not clone
-                let obj = if cls.is(PyBytes::class(&vm.ctx)) {
+                let obj = if cls.is(vm.ctx.types.bytes_type) {
                     match obj.downcast_exact::<PyBytes>(vm) {
                         Ok(b) => return Ok(b.into_pyref()),
                         Err(obj) => obj,
@@ -109,7 +109,7 @@ impl ByteInnerNewOptions {
                     // construct an exact bytes from __bytes__ slot.
                     // if __bytes__ return a bytes, use the bytes object except we are the subclass of the bytes
                     let bytes = bytes_method?.call((), vm)?;
-                    let bytes = if cls.is(PyBytes::class(&vm.ctx)) {
+                    let bytes = if cls.is(vm.ctx.types.bytes_type) {
                         match bytes.downcast::<PyBytes>() {
                             Ok(b) => return Ok(b),
                             Err(bytes) => bytes,
diff --git a/vm/src/class.rs b/vm/src/class.rs
index 799fde1644..f977f07ca7 100644
--- a/vm/src/class.rs
+++ b/vm/src/class.rs
@@ -13,16 +13,23 @@ use rustpython_common::static_cell;
 pub trait StaticType {
     // Ideally, saving PyType is better than PyTypeRef
     fn static_cell() -> &'static static_cell::StaticCell<PyTypeRef>;
+    #[inline]
     fn static_metaclass() -> &'static Py<PyType> {
         PyType::static_type()
     }
+    #[inline]
     fn static_baseclass() -> &'static Py<PyType> {
         PyBaseObject::static_type()
     }
+    #[inline]
     fn static_type() -> &'static Py<PyType> {
-        Self::static_cell()
-            .get()
-            .expect("static type has not been initialized. e.g. the native types defined in different module may be used before importing library.")
+        #[cold]
+        fn fail() -> ! {
+            panic!(
+                "static type has not been initialized. e.g. the native types defined in different module may be used before importing library."
+            );
+        }
+        Self::static_cell().get().unwrap_or_else(|| fail())
     }
     fn init_manually(typ: PyTypeRef) -> &'static Py<PyType> {
         let cell = Self::static_cell();
diff --git a/vm/src/vm/context.rs b/vm/src/vm/context.rs
index efa50b238e..54f3dfabda 100644
--- a/vm/src/vm/context.rs
+++ b/vm/src/vm/context.rs
@@ -1,9 +1,9 @@
 use crate::{
     PyResult, VirtualMachine,
     builtins::{
-        PyBaseException, PyBytes, PyComplex, PyDict, PyDictRef, PyEllipsis, PyFloat, PyFrozenSet,
-        PyInt, PyIntRef, PyList, PyListRef, PyNone, PyNotImplemented, PyStr, PyStrInterned,
-        PyTuple, PyTupleRef, PyType, PyTypeRef, bytes,
+        PyBaseException, PyByteArray, PyBytes, PyComplex, PyDict, PyDictRef, PyEllipsis, PyFloat,
+        PyFrozenSet, PyInt, PyIntRef, PyList, PyListRef, PyNone, PyNotImplemented, PyStr,
+        PyStrInterned, PyTuple, PyTupleRef, PyType, PyTypeRef,
         code::{self, PyCode},
         descriptor::{
             MemberGetter, MemberKind, MemberSetter, MemberSetterFunc, PyDescriptorOwned,
@@ -418,7 +418,7 @@ impl Context {
 
     #[inline]
     pub fn new_str(&self, s: impl Into<pystr::PyStr>) -> PyRef<PyStr> {
-        pystr::PyStr::new_ref(s, self)
+        s.into().into_ref(self)
     }
 
     pub fn interned_or_new_str<S, M>(&self, s: S) -> PyRef<PyStr>
@@ -433,8 +433,13 @@ impl Context {
     }
 
     #[inline]
-    pub fn new_bytes(&self, data: Vec<u8>) -> PyRef<bytes::PyBytes> {
-        bytes::PyBytes::new_ref(data, self)
+    pub fn new_bytes(&self, data: Vec<u8>) -> PyRef<PyBytes> {
+        PyBytes::from(data).into_ref(self)
+    }
+
+    #[inline]
+    pub fn new_bytearray(&self, data: Vec<u8>) -> PyRef<PyByteArray> {
+        PyByteArray::from(data).into_ref(self)
     }
 
     #[inline(always)]
@@ -454,12 +459,12 @@ impl Context {
 
     #[inline(always)]
     pub fn new_list(&self, elements: Vec<PyObjectRef>) -> PyListRef {
-        PyList::new_ref(elements, self)
+        PyList::from(elements).into_ref(self)
     }
 
     #[inline(always)]
     pub fn new_dict(&self) -> PyDictRef {
-        PyDict::new_ref(self)
+        PyDict::default().into_ref(self)
     }
 
     pub fn new_class(
diff --git a/vm/src/warn.rs b/vm/src/warn.rs
index 6c195d5f2e..761cd69a0d 100644
--- a/vm/src/warn.rs
+++ b/vm/src/warn.rs
@@ -1,8 +1,7 @@
 use crate::{
     AsObject, Context, Py, PyObjectRef, PyResult, VirtualMachine,
     builtins::{
-        PyDict, PyDictRef, PyListRef, PyStr, PyStrInterned, PyStrRef, PyTuple, PyTupleRef,
-        PyTypeRef,
+        PyDictRef, PyListRef, PyStr, PyStrInterned, PyStrRef, PyTuple, PyTupleRef, PyTypeRef,
     },
     convert::{IntoObject, TryFromObject},
     types::PyComparisonOp,
@@ -32,7 +31,7 @@ impl WarningsState {
     pub fn init_state(ctx: &Context) -> WarningsState {
         WarningsState {
             filters: Self::create_filter(ctx),
-            _once_registry: PyDict::new_ref(ctx),
+            _once_registry: ctx.new_dict(),
             default_action: ctx.new_str("default"),
             filters_version: 0,
         }
@@ -401,7 +400,7 @@ fn setup_context(
     let registry = if let Ok(registry) = globals.get_item(__warningregistry__, vm) {
         registry
     } else {
-        let registry = PyDict::new_ref(&vm.ctx);
+        let registry = vm.ctx.new_dict();
         globals.set_item(__warningregistry__, registry.clone().into(), vm)?;
         registry.into()
     };