diff --git a/.github/workflows/pr.yml b/.github/workflows/pr.yml
index c0eb987..b5e9d1c 100644
--- a/.github/workflows/pr.yml
+++ b/.github/workflows/pr.yml
@@ -8,9 +8,9 @@ jobs:
       matrix:
         rust:
           - version: 1.58.1
-            run-all: false
+            integration-tests: false
           - version: 1.80.1
-            run-all: true
+            integration-tests: true
 
     steps:
       - uses: actions/checkout@v2
@@ -34,25 +34,24 @@ jobs:
           rustup default ${{ matrix.rust.version }}
 
       - name: Check lib
-        run: $HOME/.cargo/bin/cargo check --lib
-
-      - name: Check all
-        # We can't use --all-targets because it includes benches which requires nightly compiler
-        run: $HOME/.cargo/bin/cargo check --workspace --lib --bins --examples --tests
-        if: ${{ matrix.rust.run-all }}
-
-      - name: Clippy
-        # We can't use --all-targets because it includes benches which requires nightly compiler
-        run: $HOME/.cargo/bin/cargo clippy --workspace --lib --bins --examples --tests
-        if: ${{ matrix.rust.run-all }}
-
-      - name: Check Format
-        run: $HOME/.cargo/bin/cargo fmt --check
-        if: ${{ matrix.rust.run-all }}
+        run: |
+          $HOME/.cargo/bin/cargo check --all-targets --no-default-features
+          $HOME/.cargo/bin/cargo check --all-targets
+          $HOME/.cargo/bin/cargo clippy --all-targets
+          $HOME/.cargo/bin/cargo fmt --check
+          $HOME/.cargo/bin/cargo test
+        env:
+          RUST_BACKTRACE: 1
 
-      - name: Test
-        run: $HOME/.cargo/bin/cargo test --workspace
-        if: ${{ matrix.rust.run-all }}
+      - name: Check integration tests
+        run: |
+          pushd integration_tests
+          $HOME/.cargo/bin/cargo check --all-targets
+          $HOME/.cargo/bin/cargo clippy --all-targets
+          $HOME/.cargo/bin/cargo fmt --check
+          $HOME/.cargo/bin/cargo test
+          popd
+        if: ${{ matrix.rust.integration-tests }}
         env:
           RUST_BACKTRACE: 1
 
diff --git a/Cargo.lock b/Cargo.lock
index f5cef51..80e22ae 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2,72 +2,11 @@
 # It is not intended for manual editing.
 version = 3
 
-[[package]]
-name = "autocfg"
-version = "1.0.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f8aac770f1885fd7e387acedd76065302551364496e46b3dd00860b2f8359b9d"
-
-[[package]]
-name = "bit-set"
-version = "0.5.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6f1efcc46c18245a69c38fcc5cc650f16d3a59d034f3106e9ed63748f695730a"
-dependencies = [
- "bit-vec",
-]
-
-[[package]]
-name = "bit-vec"
-version = "0.5.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4440d5cb623bb7390ae27fec0bb6c61111969860f8e3ae198bfa0663645e67cf"
-
-[[package]]
-name = "bitflags"
-version = "1.0.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b3c30d3802dfb7281680d6285f2ccdaa8c2d8fee41f93805dba5c4cf50dc23cf"
-
-[[package]]
-name = "byteorder"
-version = "1.2.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "74c0b906e9446b0a2e4f760cdb3fa4b2c48cdc6db8766a845c54b6ff063fd2e9"
-
 [[package]]
 name = "cfg-if"
-version = "0.1.2"
+version = "0.1.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d4c819a1287eb618df47cc647173c5c4c66ba19d888a6e50d605672aed3140de"
-
-[[package]]
-name = "dtoa"
-version = "0.4.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5edd69c67b2f8e0911629b7e6b8a34cb3956613cd7c6e6414966dee349c2db4f"
-
-[[package]]
-name = "fnv"
-version = "1.0.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "23c5f769d0418837c08fc1fafc29a25baebe21b7eb4e3149db11c37a2019d74c"
-
-[[package]]
-name = "fuchsia-zircon"
-version = "0.3.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3b5365afd01fdf916e775a224e844f80b3b9710d0f4f00903e219e859474d7ae"
-dependencies = [
- "bitflags",
- "fuchsia-zircon-sys",
-]
-
-[[package]]
-name = "fuchsia-zircon-sys"
-version = "0.3.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "069def9a0e5feb7e9120635f6ebad24d853a6affbb077fec84d0888316cf9ae6"
+checksum = "4785bdd1c96b2a846b2bd7cc02e86b6b3dbf14e7e53446c4f54c92a361040822"
 
 [[package]]
 name = "getrandom"
@@ -80,77 +19,19 @@ dependencies = [
  "wasi",
 ]
 
-[[package]]
-name = "hashbrown"
-version = "0.11.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "362385356d610bd1e5a408ddf8d022041774b683f345a1d2cfcb4f60f8ae2db5"
-
-[[package]]
-name = "indexmap"
-version = "1.8.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e6012d540c5baa3589337a98ce73408de9b5a25ec9fc2c6fd6be8f0d39e0ca5a"
-dependencies = [
- "autocfg",
- "hashbrown",
-]
-
 [[package]]
 name = "intmap"
 version = "2.0.0"
 dependencies = [
- "indexmap",
- "rand 0.8.5",
+ "rand",
  "serde",
 ]
 
-[[package]]
-name = "intmap-integration-test-random-ops"
-version = "0.1.0"
-dependencies = [
- "intmap",
- "proptest",
-]
-
-[[package]]
-name = "intmap-integration-test-serde"
-version = "0.1.0"
-dependencies = [
- "intmap",
- "proptest",
- "serde_json",
-]
-
-[[package]]
-name = "itoa"
-version = "0.3.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "91fd9dc2c587067de817fec4ad355e3818c3d893a78cab32a0a474c7a15bb8d5"
-
-[[package]]
-name = "lazy_static"
-version = "1.2.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a374c89b9db55895453a74c1e38861d9deec0b01b405a82516e9d5de4820dea1"
-
 [[package]]
 name = "libc"
-version = "0.2.64"
+version = "0.2.158"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "74dfca3d9957906e8d1e6a0b641dc9a59848e793f1da2165889fd4f62d10d79c"
-
-[[package]]
-name = "num-traits"
-version = "0.1.32"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "51eab148f171aefad295f8cece636fc488b9b392ef544da31ea4b8ef6b9e9c39"
-
-[[package]]
-name = "num-traits"
-version = "0.2.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "dee092fcdf725aee04dd7da1d21debff559237d49ef1cb3e69bcb8ece44c7364"
+checksum = "d8adc4bb1803a324070e64a98ae98f38934d91957a99cfb3a43dcbc01bc56439"
 
 [[package]]
 name = "ppv-lite86"
@@ -158,48 +39,6 @@ version = "0.2.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "237a5ed80e274dbc66f86bd59c1e25edc039660be53194b5fe0a482e0f2612ea"
 
-[[package]]
-name = "proptest"
-version = "1.0.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1e0d9cc07f18492d879586c92b485def06bc850da3118075cd45d50e9c95b0e5"
-dependencies = [
- "bit-set",
- "bitflags",
- "byteorder",
- "lazy_static",
- "num-traits 0.2.2",
- "quick-error 2.0.0",
- "rand 0.8.5",
- "rand_chacha",
- "rand_xorshift",
- "regex-syntax",
- "rusty-fork",
- "tempfile",
-]
-
-[[package]]
-name = "quick-error"
-version = "1.2.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3c36987d4978eb1be2e422b1e0423a557923a5c3e7e6f31d5699e9aafaefa469"
-
-[[package]]
-name = "quick-error"
-version = "2.0.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3ac73b1112776fc109b2e61909bc46c7e1bf0d7f690ffb1676553acce16d5cda"
-
-[[package]]
-name = "rand"
-version = "0.4.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9d5f78082e6a6d042862611e9640cf20776185fee506cf6cf67e93c6225cee31"
-dependencies = [
- "fuchsia-zircon",
- "libc",
-]
-
 [[package]]
 name = "rand"
 version = "0.8.5"
@@ -230,121 +69,14 @@ dependencies = [
  "getrandom",
 ]
 
-[[package]]
-name = "rand_xorshift"
-version = "0.3.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d25bf25ec5ae4a3f1b92f929810509a2f53d7dca2f50b794ff57e3face536c8f"
-dependencies = [
- "rand_core",
-]
-
-[[package]]
-name = "redox_syscall"
-version = "0.1.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "35a48131ab10dbeb17202bd1dcb9c9798963a58a50c9ec31640f237358832094"
-
-[[package]]
-name = "regex-syntax"
-version = "0.6.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8f1ac0f60d675cc6cf13a20ec076568254472551051ad5dd050364d70671bf6b"
-dependencies = [
- "ucd-util",
-]
-
-[[package]]
-name = "remove_dir_all"
-version = "0.5.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "dfc5b3ce5d5ea144bb04ebd093a9e14e9765bcfec866aecda9b6dec43b3d1e24"
-dependencies = [
- "winapi",
-]
-
-[[package]]
-name = "rusty-fork"
-version = "0.3.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "cb3dcc6e454c328bb824492db107ab7c0ae8fcffe4ad210136ef014458c1bc4f"
-dependencies = [
- "fnv",
- "quick-error 1.2.0",
- "tempfile",
- "wait-timeout",
-]
-
 [[package]]
 name = "serde"
 version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "369633cfe0f0bde1dfc037fb6c5a329d46586a31f981bed14d87487a3439ae37"
 
-[[package]]
-name = "serde_json"
-version = "1.0.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1c62115693d0a9ed8c32d1c760f0fdbe7d4b05cb13c135b9b54137ac0d59fccb"
-dependencies = [
- "dtoa",
- "itoa",
- "num-traits 0.1.32",
- "serde",
-]
-
-[[package]]
-name = "tempfile"
-version = "3.0.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "47776f63b85777d984a50ce49d6b9e58826b6a3766a449fc95bc66cd5663c15b"
-dependencies = [
- "libc",
- "rand 0.4.1",
- "redox_syscall",
- "remove_dir_all",
- "winapi",
-]
-
-[[package]]
-name = "ucd-util"
-version = "0.1.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3ac9567e27ca9fc45bac22f987fd62547b0ac65d2e6502dfc09cdab7dbdba31f"
-
-[[package]]
-name = "wait-timeout"
-version = "0.2.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9f200f5b12eb75f8c1ed65abd4b2db8a6e1b138a20de009dacee265a2498f3f6"
-dependencies = [
- "libc",
-]
-
 [[package]]
 name = "wasi"
 version = "0.9.0+wasi-snapshot-preview1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "cccddf32554fecc6acb585f82a32a72e28b48f8c4c1883ddfeeeaa96f7d8e519"
-
-[[package]]
-name = "winapi"
-version = "0.3.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b3ad91d846a4a5342c1fb7008d26124ee6cf94a3953751618577295373b32117"
-dependencies = [
- "winapi-i686-pc-windows-gnu",
- "winapi-x86_64-pc-windows-gnu",
-]
-
-[[package]]
-name = "winapi-i686-pc-windows-gnu"
-version = "0.3.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a16a8e2ebfc883e2b1771c6482b1fb3c6831eab289ba391619a2d93a7356220f"
-
-[[package]]
-name = "winapi-x86_64-pc-windows-gnu"
-version = "0.3.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8ca29cb03c8ceaf20f8224a18a530938305e9872b1478ea24ff44b4f503a1d1d"
diff --git a/Cargo.toml b/Cargo.toml
index eb9104e..721500e 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -15,14 +15,6 @@ serde = { version = "1.0", optional = true, default-features = false }
 
 [dev-dependencies]
 rand = "0.8.5"
-indexmap = "1.8.2"
 
 [package.metadata.docs.rs]
 features = ["serde"]
-
-[workspace]
-resolver = "2"
-members = [
-    "integration_tests/random_ops",
-    "integration_tests/serde",
-]
diff --git a/benches/basic_bench.rs b/benches/basic_bench.rs
deleted file mode 100644
index 190c5bb..0000000
--- a/benches/basic_bench.rs
+++ /dev/null
@@ -1,210 +0,0 @@
-#![feature(test)]
-
-extern crate intmap;
-extern crate rand;
-extern crate test;
-
-extern crate indexmap;
-
-use indexmap::IndexMap;
-use intmap::IntMap;
-use std::collections::HashMap;
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-    use intmap::Entry;
-    use test::Bencher;
-
-    const VEC_COUNT: usize = 10_000;
-
-    // ********** Built in **********
-
-    #[bench]
-    fn u64_insert_built_in(b: &mut Bencher) {
-        let data = get_random_range(VEC_COUNT);
-        let mut map = HashMap::with_capacity(data.len());
-
-        b.iter(|| {
-            map.clear();
-
-            for s in data.iter() {
-                test::black_box(map.insert(s, s));
-            }
-        });
-    }
-
-    #[bench]
-    fn u64_insert_built_in_without_capacity(b: &mut Bencher) {
-        let data = get_random_range(VEC_COUNT);
-
-        b.iter(|| {
-            let mut map = HashMap::new();
-
-            for s in data.iter() {
-                test::black_box(map.insert(s, s));
-            }
-
-            test::black_box(&map);
-        });
-    }
-
-    #[bench]
-    fn u64_get_built_in(b: &mut Bencher) {
-        let data = get_random_range(VEC_COUNT);
-        let mut map: HashMap<&u64, &u64> = HashMap::with_capacity(data.len());
-
-        for s in data.iter() {
-            test::black_box(map.insert(s, s));
-        }
-
-        b.iter(|| {
-            for s in data.iter() {
-                test::black_box({
-                    map.contains_key(s);
-                });
-            }
-        });
-    }
-
-    // ********** IndexMap **********
-
-    #[bench]
-    fn u64_insert_indexmap(b: &mut Bencher) {
-        let data = get_random_range(VEC_COUNT);
-        let mut map = IndexMap::with_capacity(data.len());
-
-        b.iter(|| {
-            map.clear();
-
-            for s in data.iter() {
-                test::black_box(map.insert(s, s));
-            }
-        });
-    }
-
-    #[bench]
-    fn u64_get_indexmap(b: &mut Bencher) {
-        let data = get_random_range(VEC_COUNT);
-        let mut map: IndexMap<&u64, &u64> = IndexMap::with_capacity(data.len());
-
-        for s in data.iter() {
-            test::black_box(map.insert(s, s));
-        }
-
-        b.iter(|| {
-            for s in data.iter() {
-                test::black_box({
-                    map.contains_key(s);
-                });
-            }
-        });
-    }
-
-    // ********** Intmap **********
-
-    #[bench]
-    fn u64_insert_intmap(b: &mut Bencher) {
-        let data = get_random_range(VEC_COUNT);
-        let mut map = IntMap::with_capacity(data.len());
-
-        b.iter(|| {
-            map.clear();
-
-            for s in data.iter() {
-                test::black_box(map.insert(*s, s));
-            }
-        });
-    }
-
-    #[bench]
-    fn u64_insert_intmap_checked(b: &mut Bencher) {
-        let data = get_random_range(VEC_COUNT);
-        let mut map = IntMap::with_capacity(data.len());
-
-        b.iter(|| {
-            map.clear();
-
-            for s in data.iter() {
-                test::black_box(map.insert_checked(*s, s));
-            }
-        });
-    }
-
-    #[bench]
-    fn u64_insert_intmap_entry(b: &mut Bencher) {
-        let data = get_random_range(VEC_COUNT);
-
-        let mut map = IntMap::with_capacity(data.len());
-
-        b.iter(|| {
-            map.clear();
-
-            for s in data.iter() {
-                test::black_box(match map.entry(*s) {
-                    Entry::Occupied(_) => panic!("unexpected while insert, i = {}", s),
-                    Entry::Vacant(entry) => entry.insert(s),
-                });
-            }
-        });
-    }
-
-    #[bench]
-    fn u64_insert_intmap_without_capacity(b: &mut Bencher) {
-        let data = get_random_range(VEC_COUNT);
-
-        b.iter(|| {
-            let mut map = IntMap::new();
-
-            for s in data.iter() {
-                test::black_box(map.insert(*s, s));
-            }
-
-            test::black_box(&map);
-        });
-    }
-
-    #[bench]
-    fn u64_resize_intmap(b: &mut Bencher) {
-        b.iter(|| {
-            let mut map: IntMap<u64> = IntMap::new();
-            map.reserve(VEC_COUNT);
-            test::black_box(&map);
-        });
-    }
-
-    #[bench]
-    fn u64_get_intmap(b: &mut Bencher) {
-        let data = get_random_range(VEC_COUNT);
-
-        let mut map = IntMap::with_capacity(data.len());
-        for s in data.iter() {
-            map.insert(*s, s);
-        }
-
-        b.iter(|| {
-            for s in data.iter() {
-                test::black_box(map.contains_key(*s));
-            }
-        });
-    }
-
-    // ********** Misc **********
-
-    fn get_random_range(count: usize) -> Vec<u64> {
-        use rand::prelude::StdRng;
-        use rand::{Rng, SeedableRng};
-
-        let mut vec = Vec::new();
-        let mut rng = StdRng::seed_from_u64(4242);
-
-        for _ in 0..count {
-            vec.push(rng.gen::<u64>());
-        }
-
-        vec.sort();
-        vec.dedup();
-
-        vec
-    }
-}
diff --git a/integration_tests/Cargo.lock b/integration_tests/Cargo.lock
new file mode 100644
index 0000000..f5c7434
--- /dev/null
+++ b/integration_tests/Cargo.lock
@@ -0,0 +1,637 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "anstyle"
+version = "1.0.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1bec1de6f59aedf83baf9ff929c98f2ad654b97c9510f4e70cf6f661d49fd5b1"
+
+[[package]]
+name = "autocfg"
+version = "1.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0c4b4d0bd25bd0b74681c0ad21497610ce1b7c91b1022cd21c80c6fbdd9476b0"
+
+[[package]]
+name = "bit-set"
+version = "0.5.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0700ddab506f33b20a03b13996eccd309a48e5ff77d0d95926aa0210fb4e95f1"
+dependencies = [
+ "bit-vec",
+]
+
+[[package]]
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "24d5b23dc417412679681396f2b49f3de8c1473deb516bd34410872eff51ed0d"
+
+[[package]]
+name = "windows_x86_64_msvc"
+version = "0.48.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ed94fce61571a4006852b7389a063ab983c02eb1bb37b47f8272ce92d06d9538"
+
+[[package]]
+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",
+]
diff --git a/integration_tests/Cargo.toml b/integration_tests/Cargo.toml
new file mode 100644
index 0000000..264ccee
--- /dev/null
+++ b/integration_tests/Cargo.toml
@@ -0,0 +1,7 @@
+[workspace]
+resolver = "2"
+members = [
+    "benchmark",
+    "random_ops",
+    "serde",
+]
diff --git a/integration_tests/benchmark/Cargo.toml b/integration_tests/benchmark/Cargo.toml
new file mode 100644
index 0000000..9b8d743
--- /dev/null
+++ b/integration_tests/benchmark/Cargo.toml
@@ -0,0 +1,16 @@
+[package]
+name = "intmap-integration-test-benchmark"
+version = "0.1.0"
+edition = "2021"
+license = "MIT"
+publish = false
+
+[dev-dependencies]
+divan = "0.1.14"
+indexmap = "1.8.2"
+intmap = { path = "../.." }
+rand = "0.8.5"
+
+[[bench]]
+name = "basic_bench"
+harness = false
diff --git a/integration_tests/benchmark/benches/basic_bench.rs b/integration_tests/benchmark/benches/basic_bench.rs
new file mode 100644
index 0000000..b9d15c0
--- /dev/null
+++ b/integration_tests/benchmark/benches/basic_bench.rs
@@ -0,0 +1,200 @@
+use divan::{bench, black_box, Bencher};
+use indexmap::IndexMap;
+use intmap::{Entry, IntMap};
+use std::collections::HashMap;
+
+const VEC_COUNT: usize = 10_000;
+
+fn main() {
+    divan::main();
+}
+
+// ********** Built in **********
+
+#[bench]
+fn u64_insert_built_in(bencher: Bencher) {
+    let data = get_random_range(VEC_COUNT);
+    let mut map = HashMap::with_capacity(data.len());
+
+    bencher.bench_local(|| {
+        map.clear();
+
+        for s in data.iter() {
+            black_box(map.insert(s, s));
+        }
+    });
+}
+
+#[bench]
+fn u64_insert_built_in_without_capacity(bencher: Bencher) {
+    let data = get_random_range(VEC_COUNT);
+
+    bencher.bench_local(|| {
+        let mut map = HashMap::new();
+
+        for s in data.iter() {
+            black_box(map.insert(s, s));
+        }
+
+        black_box(&map);
+    });
+}
+
+#[bench]
+fn u64_get_built_in(bencher: Bencher) {
+    let data = get_random_range(VEC_COUNT);
+    let mut map: HashMap<&u64, &u64> = HashMap::with_capacity(data.len());
+
+    for s in data.iter() {
+        black_box(map.insert(s, s));
+    }
+
+    bencher.bench_local(|| {
+        for s in data.iter() {
+            black_box({
+                map.contains_key(s);
+            });
+        }
+    });
+}
+
+// ********** IndexMap **********
+
+#[bench]
+fn u64_insert_indexmap(bencher: Bencher) {
+    let data = get_random_range(VEC_COUNT);
+    let mut map = IndexMap::with_capacity(data.len());
+
+    bencher.bench_local(|| {
+        map.clear();
+
+        for s in data.iter() {
+            black_box(map.insert(s, s));
+        }
+    });
+}
+
+#[bench]
+fn u64_get_indexmap(bencher: Bencher) {
+    let data = get_random_range(VEC_COUNT);
+    let mut map: IndexMap<&u64, &u64> = IndexMap::with_capacity(data.len());
+
+    for s in data.iter() {
+        black_box(map.insert(s, s));
+    }
+
+    bencher.bench_local(|| {
+        for s in data.iter() {
+            black_box({
+                map.contains_key(s);
+            });
+        }
+    });
+}
+
+// ********** Intmap **********
+
+#[bench]
+fn u64_insert_intmap(bencher: Bencher) {
+    let data = get_random_range(VEC_COUNT);
+    let mut map = IntMap::with_capacity(data.len());
+
+    bencher.bench_local(|| {
+        map.clear();
+
+        for s in data.iter() {
+            black_box(map.insert(*s, s));
+        }
+    });
+}
+
+#[bench]
+fn u64_insert_intmap_checked(bencher: Bencher) {
+    let data = get_random_range(VEC_COUNT);
+    let mut map = IntMap::with_capacity(data.len());
+
+    bencher.bench_local(|| {
+        map.clear();
+
+        for s in data.iter() {
+            black_box(map.insert_checked(*s, s));
+        }
+    });
+}
+
+#[bench]
+fn u64_insert_intmap_entry(bencher: Bencher) {
+    let data = get_random_range(VEC_COUNT);
+
+    let mut map = IntMap::with_capacity(data.len());
+
+    bencher.bench_local(|| {
+        map.clear();
+
+        for s in data.iter() {
+            black_box(match map.entry(*s) {
+                Entry::Occupied(_) => panic!("unexpected while insert, i = {}", s),
+                Entry::Vacant(entry) => entry.insert(s),
+            });
+        }
+    });
+}
+
+#[bench]
+fn u64_insert_intmap_without_capacity(bencher: Bencher) {
+    let data = get_random_range(VEC_COUNT);
+
+    bencher.bench_local(|| {
+        let mut map = IntMap::new();
+
+        for s in data.iter() {
+            black_box(map.insert(*s, s));
+        }
+
+        black_box(&map);
+    });
+}
+
+#[bench]
+fn u64_resize_intmap(bencher: Bencher) {
+    bencher.bench_local(|| {
+        let mut map: IntMap<u64> = IntMap::new();
+        map.reserve(VEC_COUNT);
+        black_box(&map);
+    });
+}
+
+#[bench]
+fn u64_get_intmap(bencher: Bencher) {
+    let data = get_random_range(VEC_COUNT);
+
+    let mut map = IntMap::with_capacity(data.len());
+    for s in data.iter() {
+        map.insert(*s, s);
+    }
+
+    bencher.bench_local(|| {
+        for s in data.iter() {
+            black_box(map.contains_key(*s));
+        }
+    });
+}
+
+// ********** Misc **********
+
+fn get_random_range(count: usize) -> Vec<u64> {
+    use rand::prelude::StdRng;
+    use rand::{Rng, SeedableRng};
+
+    let mut vec = Vec::new();
+    let mut rng = StdRng::seed_from_u64(4242);
+
+    for _ in 0..count {
+        vec.push(rng.gen::<u64>());
+    }
+
+    vec.sort();
+    vec.dedup();
+
+    vec
+}