diff --git a/.gitignore b/.gitignore
index 96ef6c0..84b4036 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,5 @@
 /target
 Cargo.lock
+flamegraph.svg
+perf.data
+perf.data.old
diff --git a/Cargo.toml b/Cargo.toml
index 8096db1..67dbd85 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -23,15 +23,24 @@ __test = []
 
 [dependencies]
 crossbeam-utils = { version = "0.8.12", default-features = false }
-parking = { version = "2.0.0", optional = true }
+parking = { version = "2.0", optional = true }
 
 [dev-dependencies]
-criterion = "0.3.4"
 waker-fn = "1"
 
+[dev-dependencies.criterion]
+version = "0.4"
+default-features = false
+features = ["cargo_bench_support"]
+
 [[bench]]
 name = "bench"
 harness = false
 
 [lib]
 bench = false
+
+[profile.release]
+codegen-units = 1
+debug = 1
+lto = "thin"