diff --git a/Cargo.lock b/Cargo.lock
index 8fc04a1..6bd99ea 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2,63 +2,18 @@
 # It is not intended for manual editing.
 version = 3
 
-[[package]]
-name = "addr2line"
-version = "0.22.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6e4503c46a5c0c7844e948c9a4d6acd9f50cccb4de1c48eb9e291ea17470c678"
-dependencies = [
- "gimli",
-]
-
-[[package]]
-name = "adler"
-version = "1.0.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f26201604c87b1e01bd3d98f8d5d9a8fcbb815e8cedb41ffccbeb4bf593a35fe"
-
 [[package]]
 name = "anstyle"
 version = "1.0.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1bec1de6f59aedf83baf9ff929c98f2ad654b97c9510f4e70cf6f661d49fd5b1"
 
-[[package]]
-name = "backtrace"
-version = "0.3.73"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5cc23269a4f8976d0a4d2e7109211a419fe30e8d88d677cd60b6bc79c5732e0a"
-dependencies = [
- "addr2line",
- "cc",
- "cfg-if",
- "libc",
- "miniz_oxide",
- "object",
- "rustc-demangle",
-]
-
 [[package]]
 name = "bitflags"
 version = "2.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b048fb63fd8b5923fc5aa7b340d8e156aec7ec02f0c78fa8a6ddc2613f6f71de"
 
-[[package]]
-name = "byteorder"
-version = "1.5.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1fd0f2584146f6f2ef48085050886acf353beff7305ebd1ae69500e27c67f64b"
-
-[[package]]
-name = "cc"
-version = "1.1.15"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "57b6a275aa2903740dc87da01c62040406b8812552e97129a63ea8850a17c6e6"
-dependencies = [
- "shlex",
-]
-
 [[package]]
 name = "cfg-if"
 version = "1.0.0"
@@ -97,17 +52,6 @@ version = "1.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "baf0a07a401f374238ab8e2f11a104d2851bf9ce711ec69804834de8af45c7af"
 
-[[package]]
-name = "contracts"
-version = "0.4.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c9424f2ca1e42776615720e5746eed6efa19866fdbaac2923ab51c294ac4d1f2"
-dependencies = [
- "proc-macro2",
- "quote",
- "syn 1.0.109",
-]
-
 [[package]]
 name = "crossbeam-deque"
 version = "0.8.5"
@@ -155,7 +99,7 @@ checksum = "27540baf49be0d484d8f0130d7d8da3011c32a44d4fc873368154f1510e574a2"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.75",
+ "syn",
 ]
 
 [[package]]
@@ -174,23 +118,6 @@ dependencies = [
  "windows-sys 0.52.0",
 ]
 
-[[package]]
-name = "getrandom"
-version = "0.1.16"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8fc3cb4d91f53b50155bdcfd23f6a4c39ae1969c2ae85982b135750cccaf5fce"
-dependencies = [
- "cfg-if",
- "libc",
- "wasi",
-]
-
-[[package]]
-name = "gimli"
-version = "0.29.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "40ecd4077b5ae9fd2e9e169b102c6c330d0605168eb0e8bf79952b256dbefffd"
-
 [[package]]
 name = "libc"
 version = "0.2.158"
@@ -203,49 +130,6 @@ version = "0.4.14"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "78b3ae25bc7c8c38cec158d1f2757ee79e9b3740fbc7ccf0e59e4b08d793fa89"
 
-[[package]]
-name = "memchr"
-version = "2.7.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "78ca9ab1a0babb1e7d5695e3530886289c18cf2f87ec19a575a0abdce112e3a3"
-
-[[package]]
-name = "miniz_oxide"
-version = "0.7.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b8a240ddb74feaf34a79a7add65a741f3167852fba007066dcac1ca548d89c08"
-dependencies = [
- "adler",
-]
-
-[[package]]
-name = "no_deadlocks"
-version = "1.3.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e0e0af0e4fcf0d695f224cafbf5e4fb750b85aa1cd1ad0b37d8d0d98c0d2ce5e"
-dependencies = [
- "backtrace",
- "vector-map",
-]
-
-[[package]]
-name = "object"
-version = "0.36.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "084f1a5821ac4c651660a94a7153d27ac9d8a53736203f58b31945ded098070a"
-dependencies = [
- "memchr",
-]
-
-[[package]]
-name = "ppv-lite86"
-version = "0.2.20"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "77957b295656769bb8ad2b6a6b09d897d94f05c41b069aede1fcdaa675eaea04"
-dependencies = [
- "zerocopy",
-]
-
 [[package]]
 name = "proc-macro2"
 version = "1.0.86"
@@ -264,47 +148,6 @@ dependencies = [
  "proc-macro2",
 ]
 
-[[package]]
-name = "rand"
-version = "0.7.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6a6b1679d49b24bbfe0c803429aa1874472f50d9b363131f0e89fc356b544d03"
-dependencies = [
- "getrandom",
- "libc",
- "rand_chacha",
- "rand_core",
- "rand_hc",
-]
-
-[[package]]
-name = "rand_chacha"
-version = "0.2.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f4c8ed856279c9737206bf725bf36935d8666ead7aa69b52be55af369d193402"
-dependencies = [
- "ppv-lite86",
- "rand_core",
-]
-
-[[package]]
-name = "rand_core"
-version = "0.5.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "90bde5296fc891b0cef12a6d03ddccc162ce7b2aff54160af9338f8d40df6d19"
-dependencies = [
- "getrandom",
-]
-
-[[package]]
-name = "rand_hc"
-version = "0.2.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ca3129af7b92a17112d59ad498c6f81eaf463253766b90396d39ea7a39d6613c"
-dependencies = [
- "rand_core",
-]
-
 [[package]]
 name = "rayon"
 version = "1.10.0"
@@ -331,12 +174,6 @@ version = "0.1.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "53a49587ad06b26609c52e423de037e7f57f20d53535d66e08c695f347df952a"
 
-[[package]]
-name = "rustc-demangle"
-version = "0.1.24"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "719b953e2095829ee67db738b3bfa9fa368c94900df327b3f07fe6e794d2fe1f"
-
 [[package]]
 name = "rustix"
 version = "0.38.34"
@@ -350,32 +187,14 @@ dependencies = [
  "windows-sys 0.52.0",
 ]
 
-[[package]]
-name = "shlex"
-version = "1.3.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0fda2ff0d084019ba4d7c6f371c95d8fd75ce3524c3cb8fb653a3023f6323e64"
-
 [[package]]
 name = "spice"
 version = "0.1.0"
 dependencies = [
  "divan",
- "no_deadlocks",
  "rayon",
 ]
 
-[[package]]
-name = "syn"
-version = "1.0.109"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "72b64191b275b66ffe2469e8af2c1cfe3bafa67b529ead792a6d0160888b4237"
-dependencies = [
- "proc-macro2",
- "quote",
- "unicode-ident",
-]
-
 [[package]]
 name = "syn"
 version = "2.0.75"
@@ -403,22 +222,6 @@ version = "1.0.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "3354b9ac3fae1ff6755cb6db53683adb661634f67557942dea4facebec0fee4b"
 
-[[package]]
-name = "vector-map"
-version = "1.0.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "550f72ae94a45c0e2139188709e6c4179f0b5ff9bdaa435239ad19048b0cd68c"
-dependencies = [
- "contracts",
- "rand",
-]
-
-[[package]]
-name = "wasi"
-version = "0.9.0+wasi-snapshot-preview1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "cccddf32554fecc6acb585f82a32a72e28b48f8c4c1883ddfeeeaa96f7d8e519"
-
 [[package]]
 name = "windows-sys"
 version = "0.48.0"
@@ -557,24 +360,3 @@ name = "windows_x86_64_msvc"
 version = "0.52.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "589f6da84c646204747d1270a2a5661ea66ed1cced2631d546fdfb155959f9ec"
-
-[[package]]
-name = "zerocopy"
-version = "0.7.35"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1b9b4fd18abc82b8136838da5d50bae7bdea537c574d8dc1a34ed098d6c166f0"
-dependencies = [
- "byteorder",
- "zerocopy-derive",
-]
-
-[[package]]
-name = "zerocopy-derive"
-version = "0.7.35"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fa4f8080344d4671fb4e831a13ad1e68092748387dfc4f55e356242fae12ce3e"
-dependencies = [
- "proc-macro2",
- "quote",
- "syn 2.0.75",
-]
diff --git a/Cargo.toml b/Cargo.toml
index ee9a6ac..75cdf28 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -3,13 +3,14 @@ name = "spice"
 version = "0.1.0"
 edition = "2021"
 
-[dev-dependencies]
-divan = "0.1.14"
+[features]
+bench = ["dep:divan", "dep:rayon"]
+
+[dependencies]
+divan = { version = "0.1.14", optional = true }
+rayon = { version = "1.10.0", optional = true }
 
 [[bench]]
 name = "overhead"
 harness = false
-
-[dependencies]
-no_deadlocks = "1.3.2"
-rayon = "1.10.0"
+required-features = ["bench"]
diff --git a/benches/overhead.rs b/benches/overhead.rs
index 3965372..b048948 100644
--- a/benches/overhead.rs
+++ b/benches/overhead.rs
@@ -56,7 +56,6 @@ fn no_overhead(bencher: Bencher, nodes: (usize, usize)) {
 
 #[divan::bench(args = nodes())]
 fn overhead(bencher: Bencher, nodes: (usize, usize)) {
-    #[inline]
     fn sum(node: &Node, scope: &mut Scope<'_>) -> u64 {
         let (left, right) = scope.join(
             |s| node.left.as_deref().map(|n| sum(n, s)).unwrap_or_default(),
@@ -77,7 +76,6 @@ fn overhead(bencher: Bencher, nodes: (usize, usize)) {
 
 #[divan::bench(args = nodes())]
 fn rayon_overhead(bencher: Bencher, nodes: (usize, usize)) {
-    #[inline]
     fn sum(node: &Node) -> u64 {
         let (left, right) = rayon::join(
             || node.left.as_deref().map(sum).unwrap_or_default(),