diff --git a/src/bench.rs b/src/bench.rs
new file mode 100644
index 0000000..21462bd
--- /dev/null
+++ b/src/bench.rs
@@ -0,0 +1,70 @@
+//! `-Zmiri-disable-isolation` needed to run these under miri
+
+use test::{Bencher, black_box};
+
+extern crate test;
+
+use super::Vec;
+use std::{vec::Vec as StdVec, fmt::Debug};
+
+#[bench]
+#[ignore = "ignored for miri compat"]
+fn std_push(b: &mut Bencher) {
+    let mut vec = StdVec::new();
+
+    b.iter(|| vec.push(black_box(5)));
+
+    black_box(vec);
+}
+
+#[bench]
+#[ignore = "ignored for miri compat"]
+fn dyn_push(b: &mut Bencher) {
+    let mut vec = Vec::new();
+
+    b.iter(|| vec.push(black_box(5)));
+
+    black_box(vec);
+}
+
+#[bench]
+#[ignore = "ignored for miri compat"]
+fn std_push_box(b: &mut Bencher) {
+    let mut vec = StdVec::new();
+
+    b.iter(|| vec.push(black_box(Box::new(5) as Box<dyn Debug>)));
+
+    black_box(vec);
+}
+
+#[bench]
+#[ignore = "ignored for miri compat"]
+fn dyn_push_unsize(b: &mut Bencher) {
+    let mut vec = Vec::new();
+
+    b.iter(|| vec.push_unsize_stable(black_box(5), |v| v as &dyn Debug));
+
+    black_box(vec);
+}
+
+#[bench]
+#[ignore = "ignored for miri compat"]
+fn dyn_push_box(b: &mut Bencher) {
+    let mut vec = Vec::new();
+
+    b.iter(|| vec.push_box(black_box(Box::new(5) as Box<dyn Debug>)));
+
+    black_box(vec);
+}
+
+#[bench]
+#[ignore = "ignored for miri compat"]
+fn dyn_push_then_unsize(b: &mut Bencher) {
+    let mut vec = Vec::new();
+
+    b.iter(|| vec.push(black_box(5)));
+
+    let vec = black_box(vec).unsize_stable(|v| v as &dyn Debug);
+
+    black_box(vec);
+}
\ No newline at end of file
diff --git a/src/impls.rs b/src/impls.rs
index 6e77888..8fd7b8e 100644
--- a/src/impls.rs
+++ b/src/impls.rs
@@ -4,6 +4,9 @@ use crate::{Vec, Extra};
 
 use std::{fmt::Debug, ops::{Deref, DerefMut}, vec::Vec as StdVec, slice, mem::size_of};
 
+#[cfg(feature = "unstable")]
+use std::ops::CoerceUnsized;
+
 impl<T: ?Sized> Default for Vec<T> {
     fn default() -> Self {
         Self::new()
diff --git a/src/lib.rs b/src/lib.rs
index 15220d7..f0b32df 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -122,8 +122,11 @@
 #![warn(clippy::pedantic)]
 #![allow(clippy::must_use_candidate)]
 
+#![cfg_attr(test, feature(test))]
 #[cfg(test)]
 mod test;
+#[cfg(test)]
+mod bench;
 
 // TODO: maybe remove this? Its not that many imports
 /// Prelude, suitable for glob imports.