diff --git a/src/conversion.rs b/src/conversion.rs
index 1e3fdf2..5b907c0 100644
--- a/src/conversion.rs
+++ b/src/conversion.rs
@@ -20,24 +20,28 @@ use crate::userdata::{AnyUserData, UserData};
 use crate::value::{FromLua, Nil, ToLua, Value};
 
 impl<'lua> ToLua<'lua> for Value<'lua> {
+    #[inline]
     fn to_lua(self, _: &'lua Lua) -> Result<Value<'lua>> {
         Ok(self)
     }
 }
 
 impl<'lua> FromLua<'lua> for Value<'lua> {
+    #[inline]
     fn from_lua(lua_value: Value<'lua>, _: &'lua Lua) -> Result<Self> {
         Ok(lua_value)
     }
 }
 
 impl<'lua> ToLua<'lua> for String<'lua> {
+    #[inline]
     fn to_lua(self, _: &'lua Lua) -> Result<Value<'lua>> {
         Ok(Value::String(self))
     }
 }
 
 impl<'lua> FromLua<'lua> for String<'lua> {
+    #[inline]
     fn from_lua(value: Value<'lua>, lua: &'lua Lua) -> Result<String<'lua>> {
         let ty = value.type_name();
         lua.coerce_string(value)?
@@ -50,12 +54,14 @@ impl<'lua> FromLua<'lua> for String<'lua> {
 }
 
 impl<'lua> ToLua<'lua> for Table<'lua> {
+    #[inline]
     fn to_lua(self, _: &'lua Lua) -> Result<Value<'lua>> {
         Ok(Value::Table(self))
     }
 }
 
 impl<'lua> FromLua<'lua> for Table<'lua> {
+    #[inline]
     fn from_lua(value: Value<'lua>, _: &'lua Lua) -> Result<Table<'lua>> {
         match value {
             Value::Table(table) => Ok(table),
@@ -69,12 +75,14 @@ impl<'lua> FromLua<'lua> for Table<'lua> {
 }
 
 impl<'lua> ToLua<'lua> for Function<'lua> {
+    #[inline]
     fn to_lua(self, _: &'lua Lua) -> Result<Value<'lua>> {
         Ok(Value::Function(self))
     }
 }
 
 impl<'lua> FromLua<'lua> for Function<'lua> {
+    #[inline]
     fn from_lua(value: Value<'lua>, _: &'lua Lua) -> Result<Function<'lua>> {
         match value {
             Value::Function(table) => Ok(table),
@@ -88,12 +96,14 @@ impl<'lua> FromLua<'lua> for Function<'lua> {
 }
 
 impl<'lua> ToLua<'lua> for Thread<'lua> {
+    #[inline]
     fn to_lua(self, _: &'lua Lua) -> Result<Value<'lua>> {
         Ok(Value::Thread(self))
     }
 }
 
 impl<'lua> FromLua<'lua> for Thread<'lua> {
+    #[inline]
     fn from_lua(value: Value<'lua>, _: &'lua Lua) -> Result<Thread<'lua>> {
         match value {
             Value::Thread(t) => Ok(t),
@@ -107,12 +117,14 @@ impl<'lua> FromLua<'lua> for Thread<'lua> {
 }
 
 impl<'lua> ToLua<'lua> for AnyUserData<'lua> {
+    #[inline]
     fn to_lua(self, _: &'lua Lua) -> Result<Value<'lua>> {
         Ok(Value::UserData(self))
     }
 }
 
 impl<'lua> FromLua<'lua> for AnyUserData<'lua> {
+    #[inline]
     fn from_lua(value: Value<'lua>, _: &'lua Lua) -> Result<AnyUserData<'lua>> {
         match value {
             Value::UserData(ud) => Ok(ud),
@@ -126,12 +138,14 @@ impl<'lua> FromLua<'lua> for AnyUserData<'lua> {
 }
 
 impl<'lua, T: 'static + MaybeSend + UserData> ToLua<'lua> for T {
+    #[inline]
     fn to_lua(self, lua: &'lua Lua) -> Result<Value<'lua>> {
         Ok(Value::UserData(lua.create_userdata(self)?))
     }
 }
 
 impl<'lua, T: 'static + UserData + Clone> FromLua<'lua> for T {
+    #[inline]
     fn from_lua(value: Value<'lua>, _: &'lua Lua) -> Result<T> {
         match value {
             Value::UserData(ud) => Ok(ud.borrow::<T>()?.clone()),
@@ -145,12 +159,14 @@ impl<'lua, T: 'static + UserData + Clone> FromLua<'lua> for T {
 }
 
 impl<'lua> ToLua<'lua> for Error {
+    #[inline]
     fn to_lua(self, _: &'lua Lua) -> Result<Value<'lua>> {
         Ok(Value::Error(self))
     }
 }
 
 impl<'lua> FromLua<'lua> for Error {
+    #[inline]
     fn from_lua(value: Value<'lua>, lua: &'lua Lua) -> Result<Error> {
         match value {
             Value::Error(err) => Ok(err),
@@ -164,12 +180,14 @@ impl<'lua> FromLua<'lua> for Error {
 }
 
 impl<'lua> ToLua<'lua> for bool {
+    #[inline]
     fn to_lua(self, _: &'lua Lua) -> Result<Value<'lua>> {
         Ok(Value::Boolean(self))
     }
 }
 
 impl<'lua> FromLua<'lua> for bool {
+    #[inline]
     fn from_lua(v: Value<'lua>, _: &'lua Lua) -> Result<Self> {
         match v {
             Value::Nil => Ok(false),
@@ -180,12 +198,14 @@ impl<'lua> FromLua<'lua> for bool {
 }
 
 impl<'lua> ToLua<'lua> for LightUserData {
+    #[inline]
     fn to_lua(self, _: &'lua Lua) -> Result<Value<'lua>> {
         Ok(Value::LightUserData(self))
     }
 }
 
 impl<'lua> FromLua<'lua> for LightUserData {
+    #[inline]
     fn from_lua(value: Value<'lua>, _: &'lua Lua) -> Result<Self> {
         match value {
             Value::LightUserData(ud) => Ok(ud),
@@ -199,12 +219,14 @@ impl<'lua> FromLua<'lua> for LightUserData {
 }
 
 impl<'lua> ToLua<'lua> for StdString {
+    #[inline]
     fn to_lua(self, lua: &'lua Lua) -> Result<Value<'lua>> {
         Ok(Value::String(lua.create_string(&self)?))
     }
 }
 
 impl<'lua> FromLua<'lua> for StdString {
+    #[inline]
     fn from_lua(value: Value<'lua>, lua: &'lua Lua) -> Result<Self> {
         let ty = value.type_name();
         Ok(lua
@@ -220,6 +242,7 @@ impl<'lua> FromLua<'lua> for StdString {
 }
 
 impl<'lua> ToLua<'lua> for &str {
+    #[inline]
     fn to_lua(self, lua: &'lua Lua) -> Result<Value<'lua>> {
         Ok(Value::String(lua.create_string(self)?))
     }
@@ -595,6 +618,7 @@ impl<'lua, T: Ord + FromLua<'lua>> FromLua<'lua> for BTreeSet<T> {
 }
 
 impl<'lua, T: ToLua<'lua>> ToLua<'lua> for Option<T> {
+    #[inline]
     fn to_lua(self, lua: &'lua Lua) -> Result<Value<'lua>> {
         match self {
             Some(val) => val.to_lua(lua),
@@ -604,6 +628,7 @@ impl<'lua, T: ToLua<'lua>> ToLua<'lua> for Option<T> {
 }
 
 impl<'lua, T: FromLua<'lua>> FromLua<'lua> for Option<T> {
+    #[inline]
     fn from_lua(value: Value<'lua>, lua: &'lua Lua) -> Result<Self> {
         match value {
             Nil => Ok(None),
diff --git a/src/thread.rs b/src/thread.rs
index 632c341..20e9abd 100644
--- a/src/thread.rs
+++ b/src/thread.rs
@@ -341,6 +341,7 @@ where
 }
 
 #[cfg(feature = "async")]
+#[inline(always)]
 fn is_poll_pending(val: &MultiValue) -> bool {
     match val.iter().enumerate().last() {
         Some((1, Value::LightUserData(ud))) => {
diff --git a/src/userdata.rs b/src/userdata.rs
index 113725f..ead279c 100644
--- a/src/userdata.rs
+++ b/src/userdata.rs
@@ -597,11 +597,13 @@ pub trait UserData: Sized {
 pub(crate) struct UserDataCell<T>(RefCell<UserDataWrapped<T>>);
 
 impl<T> UserDataCell<T> {
+    #[inline]
     pub(crate) fn new(data: T) -> Self {
         UserDataCell(RefCell::new(UserDataWrapped::new(data)))
     }
 
     #[cfg(feature = "serialize")]
+    #[inline]
     pub(crate) fn new_ser(data: T) -> Self
     where
         T: 'static + Serialize,
@@ -610,6 +612,7 @@ impl<T> UserDataCell<T> {
     }
 
     // Immutably borrows the wrapped value.
+    #[inline]
     fn try_borrow(&self) -> Result<Ref<T>> {
         self.0
             .try_borrow()
@@ -618,6 +621,7 @@ impl<T> UserDataCell<T> {
     }
 
     // Mutably borrows the wrapped value.
+    #[inline]
     fn try_borrow_mut(&self) -> Result<RefMut<T>> {
         self.0
             .try_borrow_mut()
@@ -633,11 +637,13 @@ pub(crate) enum UserDataWrapped<T> {
 }
 
 impl<T> UserDataWrapped<T> {
+    #[inline]
     fn new(data: T) -> Self {
         UserDataWrapped::Default(data)
     }
 
     #[cfg(feature = "serialize")]
+    #[inline]
     fn new_ser(data: T) -> Self
     where
         T: 'static + Serialize,
@@ -659,6 +665,7 @@ impl<T> Drop for UserDataWrapped<T> {
 impl<T> Deref for UserDataWrapped<T> {
     type Target = T;
 
+    #[inline]
     fn deref(&self) -> &Self::Target {
         match self {
             Self::Default(data) => data,
@@ -669,6 +676,7 @@ impl<T> Deref for UserDataWrapped<T> {
 }
 
 impl<T> DerefMut for UserDataWrapped<T> {
+    #[inline]
     fn deref_mut(&mut self) -> &mut Self::Target {
         match self {
             Self::Default(data) => data,
@@ -726,6 +734,7 @@ impl<'lua> AnyUserData<'lua> {
     ///
     /// Returns a `UserDataBorrowError` if the userdata is already mutably borrowed. Returns a
     /// `UserDataTypeMismatch` if the userdata is not of type `T`.
+    #[inline]
     pub fn borrow<T: 'static + UserData>(&self) -> Result<Ref<T>> {
         self.inspect(|cell| cell.try_borrow())
     }
@@ -736,6 +745,7 @@ impl<'lua> AnyUserData<'lua> {
     ///
     /// Returns a `UserDataBorrowMutError` if the userdata cannot be mutably borrowed.
     /// Returns a `UserDataTypeMismatch` if the userdata is not of type `T`.
+    #[inline]
     pub fn borrow_mut<T: 'static + UserData>(&self) -> Result<RefMut<T>> {
         self.inspect(|cell| cell.try_borrow_mut())
     }
diff --git a/src/util.rs b/src/util.rs
index fa11981..41de848 100644
--- a/src/util.rs
+++ b/src/util.rs
@@ -19,6 +19,7 @@ static METATABLE_CACHE: Lazy<Mutex<HashMap<TypeId, u8>>> = Lazy::new(|| {
 
 // Checks that Lua has enough free stack space for future stack operations. On failure, this will
 // panic with an internal error message.
+#[inline]
 pub unsafe fn assert_stack(state: *mut ffi::lua_State, amount: c_int) {
     // TODO: This should only be triggered when there is a logic error in `mlua`. In the future,
     // when there is a way to be confident about stack safety and test it, this could be enabled
@@ -30,6 +31,7 @@ pub unsafe fn assert_stack(state: *mut ffi::lua_State, amount: c_int) {
 }
 
 // Checks that Lua has enough free stack space and returns `Error::StackError` on failure.
+#[inline]
 pub unsafe fn check_stack(state: *mut ffi::lua_State, amount: c_int) -> Result<()> {
     if ffi::lua_checkstack(state, amount) == 0 {
         Err(Error::StackError)
@@ -48,6 +50,7 @@ impl StackGuard {
     // Creates a StackGuard instance with record of the stack size, and on Drop will check the
     // stack size and drop any extra elements. If the stack size at the end is *smaller* than at
     // the beginning, this is considered a fatal logic error and will result in a panic.
+    #[inline]
     pub unsafe fn new(state: *mut ffi::lua_State) -> StackGuard {
         StackGuard {
             state,
@@ -57,6 +60,7 @@ impl StackGuard {
     }
 
     // Similar to `new`, but checks and keeps `extra` elements from top of the stack on Drop.
+    #[inline]
     pub unsafe fn new_extra(state: *mut ffi::lua_State, extra: c_int) -> StackGuard {
         StackGuard {
             state,
@@ -211,6 +215,7 @@ pub unsafe fn pop_error(state: *mut ffi::lua_State, err_code: c_int) -> Error {
 }
 
 // Uses 3 stack spaces
+#[inline]
 pub unsafe fn push_string<S: AsRef<[u8]> + ?Sized>(
     state: *mut ffi::lua_State,
     s: &S,
@@ -222,6 +227,7 @@ pub unsafe fn push_string<S: AsRef<[u8]> + ?Sized>(
 }
 
 // Uses 3 stack spaces
+#[inline]
 pub unsafe fn push_table(state: *mut ffi::lua_State, narr: c_int, nrec: c_int) -> Result<()> {
     protect_lua(state, 0, 1, |state| ffi::lua_createtable(state, narr, nrec))
 }
@@ -241,6 +247,7 @@ where
 }
 
 // Internally uses 3 stack spaces, does not call checkstack.
+#[inline]
 pub unsafe fn push_userdata<T>(state: *mut ffi::lua_State, t: T) -> Result<()> {
     let ud = protect_lua(state, 0, 1, |state| {
         ffi::lua_newuserdata(state, mem::size_of::<T>()) as *mut T
@@ -249,6 +256,7 @@ pub unsafe fn push_userdata<T>(state: *mut ffi::lua_State, t: T) -> Result<()> {
     Ok(())
 }
 
+#[inline]
 pub unsafe fn get_userdata<T>(state: *mut ffi::lua_State, index: c_int) -> *mut T {
     let ud = ffi::lua_touserdata(state, index) as *mut T;
     mlua_debug_assert!(!ud.is_null(), "userdata pointer is null");
diff --git a/src/value.rs b/src/value.rs
index 7399844..2196c6d 100644
--- a/src/value.rs
+++ b/src/value.rs
@@ -157,18 +157,21 @@ pub struct MultiValue<'lua>(Vec<Value<'lua>>);
 
 impl<'lua> MultiValue<'lua> {
     /// Creates an empty `MultiValue` containing no values.
+    #[inline]
     pub fn new() -> MultiValue<'lua> {
         MultiValue(Vec::new())
     }
 }
 
 impl<'lua> Default for MultiValue<'lua> {
+    #[inline]
     fn default() -> MultiValue<'lua> {
         MultiValue::new()
     }
 }
 
 impl<'lua> FromIterator<Value<'lua>> for MultiValue<'lua> {
+    #[inline]
     fn from_iter<I: IntoIterator<Item = Value<'lua>>>(iter: I) -> Self {
         MultiValue::from_vec(Vec::from_iter(iter))
     }
@@ -178,6 +181,7 @@ impl<'lua> IntoIterator for MultiValue<'lua> {
     type Item = Value<'lua>;
     type IntoIter = iter::Rev<vec::IntoIter<Value<'lua>>>;
 
+    #[inline]
     fn into_iter(self) -> Self::IntoIter {
         self.0.into_iter().rev()
     }
@@ -187,43 +191,52 @@ impl<'a, 'lua> IntoIterator for &'a MultiValue<'lua> {
     type Item = &'a Value<'lua>;
     type IntoIter = iter::Rev<slice::Iter<'a, Value<'lua>>>;
 
+    #[inline]
     fn into_iter(self) -> Self::IntoIter {
         (&self.0).iter().rev()
     }
 }
 
 impl<'lua> MultiValue<'lua> {
+    #[inline]
     pub fn from_vec(mut v: Vec<Value<'lua>>) -> MultiValue<'lua> {
         v.reverse();
         MultiValue(v)
     }
 
+    #[inline]
     pub fn into_vec(self) -> Vec<Value<'lua>> {
         let mut v = self.0;
         v.reverse();
         v
     }
 
+    #[inline]
     pub(crate) fn reserve(&mut self, size: usize) {
         self.0.reserve(size);
     }
 
+    #[inline]
     pub(crate) fn push_front(&mut self, value: Value<'lua>) {
         self.0.push(value);
     }
 
+    #[inline]
     pub(crate) fn pop_front(&mut self) -> Option<Value<'lua>> {
         self.0.pop()
     }
 
+    #[inline]
     pub fn len(&self) -> usize {
         self.0.len()
     }
 
+    #[inline]
     pub fn is_empty(&self) -> bool {
         self.0.len() == 0
     }
 
+    #[inline]
     pub fn iter(&self) -> iter::Rev<slice::Iter<Value<'lua>>> {
         self.0.iter().rev()
     }