diff --git a/benchmark/package-lock.json b/benchmark/package-lock.json
deleted file mode 100644
index 6f70a73..0000000
--- a/benchmark/package-lock.json
+++ /dev/null
@@ -1,1320 +0,0 @@
-{
-  "name": "benchmark",
-  "version": "1.0.0",
-  "lockfileVersion": 2,
-  "requires": true,
-  "packages": {
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-        "encodeurl": "~1.0.2",
-        "escape-html": "~1.0.3",
-        "parseurl": "~1.3.3",
-        "send": "0.17.1"
-      }
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diff --git a/benchmark/package.json b/benchmark/package.json
index 558f166..b066afe 100644
--- a/benchmark/package.json
+++ b/benchmark/package.json
@@ -13,6 +13,7 @@
   "dependencies": {
     "benchmarkjs-pretty": "^2.0.0",
     "express": "^4.17.1",
-    "koa-router": "^8.0.8"
+    "koa-router": "^8.0.8",
+    "mitata": "^1.0.10"
   }
 }
diff --git a/benchmark/promise.mjs b/benchmark/promise.mjs
new file mode 100644
index 0000000..99f585f
--- /dev/null
+++ b/benchmark/promise.mjs
@@ -0,0 +1,221 @@
+import { summary, run, bench } from 'mitata';
+
+// Warmup (de-optimize `bench()` calls)
+bench('noop', () => { });
+bench('noop2', () => { });
+
+// Example benchmark
+/*summary(() => {
+  const fn = () => null
+  const fnAlt = function() {}
+  function fnBasic() {}
+  const fnAltWithReturn = function() { return null }
+  function fnBasicWithReturn() { return null }
+
+  bench('Reject with uncached error handler', async () => await Promise.reject().catch(() => null));
+  bench('Reject with cached error handler', async () => await Promise.reject().catch(fn));
+
+  bench('TT Reject with uncached error handler', () => Promise.reject().catch(() => null));
+  bench('TT Reject with cached error handler', () => Promise.reject().catch(fnAlt));
+  bench('TT Reject with cached basic error handler', () => Promise.reject().catch(fnBasic));
+  bench('TT Reject with cached error handler with return', () => Promise.reject().catch(fnAltWithReturn));
+  bench('TT Reject with cached basic error handler with return ', () => Promise.reject().catch(fnBasicWithReturn));
+});*/
+
+/*
+summary(() => {
+  function triple () {
+    const bla = Math.round(Math.random()) ? true : null
+    return bla === null
+  }
+  function doubleNull () {
+    const bla = Math.round(Math.random()) ? true : null
+    return bla == null
+  }
+  function doubleUndefined () {
+    const bla = Math.round(Math.random()) ? true : undefined
+    return bla == null
+  }
+  bench('null === null', triple);
+  bench('null == null', doubleNull);
+  bench('undefined == null', doubleUndefined);
+
+  bench('2x null === null', triple);
+  bench('2x null == null', doubleNull);
+  bench('2x undefined == null', doubleUndefined);
+})
+
+
+summary(() => {
+  function triple () {
+    const bla = false ? true : null
+    return bla === null
+  }
+  function doubleNull () {
+    const bla = false ? true : null
+    return bla == null
+  }
+  function doubleUndefined () {
+    const bla = false ? true : undefined
+    return bla == null
+  }
+  bench('const null === null', triple);
+  bench('const null == null', doubleNull);
+  bench('const undefined == null', doubleUndefined);
+
+  bench('const 2x null === null', triple);
+  bench('const 2x null == null', doubleNull);
+  bench('const 2x undefined == null', doubleUndefined);
+})*/
+
+function printCurrentStatus(fn) {
+  let opt = %GetOptimizationStatus(fn)
+  console.log(`${fn.toString()}
+${opt.toString(2).padStart(12, '0').split('').join(' ')}`)
+}
+function printTree() {
+  console.log(`┬ ┬ ┬ ┬ ┬ ┬ ┬ ┬ ┬ ┬ ┬ ┬
+│ │ │ │ │ │ │ │ │ │ │ └─╸ is function
+│ │ │ │ │ │ │ │ │ │ └───╸ is never optimized
+│ │ │ │ │ │ │ │ │ └─────╸ is always optimized
+│ │ │ │ │ │ │ │ └───────╸ is maybe deoptimized
+│ │ │ │ │ │ │ └─────────╸ is optimized
+│ │ │ │ │ │ └───────────╸ is optimized by TurboFan
+│ │ │ │ │ └─────────────╸ is interpreted
+│ │ │ │ └───────────────╸ is marked for optimization
+│ │ │ └─────────────────╸ is marked for concurrent optimization
+│ │ └───────────────────╸ is optimizing concurrently
+│ └─────────────────────╸ is executing
+└───────────────────────╸ topmost frame is turbo fanned`)
+}
+
+let func1
+let func2
+let func3
+
+await (async function () {
+  return
+  const fn1 = async () => await Promise.reject().catch(() => null) === null ? 1 : 0;
+  const fn2 = async () => await Promise.reject().catch(() => {}) == null ? 1 : 0;
+  const fn3 = async () => await Promise.reject().catch(() => null) == null ? 1 : 0;
+  const noop = () => null;
+  const fn4 = async () => await Promise.reject().catch(noop) == null ? 1 : 0;
+  const fn5 = async () => await Promise.reject().catch(noop) === null ? 1 : 0;
+  
+  
+  const fn6 = () => Promise.reject().catch(() => null).then(x => x === null ? 1 : 0);
+  const fn7 = () => Promise.reject().catch(() => {}).then(x => x == null ? 1 : 0);
+  const fn8 = () => Promise.reject().catch(() => null).then(x => x == null ? 1 : 0);
+  const fn9 = () => Promise.reject().catch(noop).then(x => x == null ? 1 : 0);
+  const fn10 = () => Promise.reject().catch(noop).then(x => x === null ? 1 : 0);
+
+  func1 = [fn1, fn2, fn3, fn4, fn5, fn6, fn7, fn8, fn9, fn10];
+  for (let fun of func1) {
+    %OptimizeFunctionOnNextCall(fun);
+  }
+  for (var i = 0; i < 100000; i++) {
+    for (let fun of func1) {
+      await fun()
+    }
+  }
+  for (let fun of func1) {
+    printCurrentStatus(fun);
+  }
+  printTree()
+
+  summary(() => {
+    bench('Null with ===', fn1);
+    bench('Undefined with ==', fn2);
+    bench('Null with ==', fn3);
+    bench('Cached Null with ==', fn4);
+    bench('Cached Null with ===', fn5);
+  
+  
+    bench('[sync] Null with ===', fn6);
+    bench('[sync] Undefined with ==', fn7);
+    bench('[sync] Null with ==', fn8);
+    bench('[sync] Cached Null with ==', fn9);
+    bench('[sync] Cached Null with ===', fn10);
+  });
+})
+
+
+await (async function () {
+  const alt1 = function () { (Math.round(Math.random()) ? null : 1) ?? 0 };
+  const alt2 = function () { (Math.round(Math.random()) ? null : 1) || 0 };
+  const alt3 = function () { (Math.round(Math.random()) ? undefined : 1) ?? 0 };
+  const alt4 = function () { (Math.round(Math.random()) ? undefined : 1) || 0 };
+
+  let check = new Array(100).fill(0).map(() => Math.round(Math.random()) ? null : 1)
+  let check2 = new Array(100).fill(0).map(() => Math.round(Math.random()) ? undefined : 1)
+
+  const alt5 = function () { let out = 0; for (let x of check) { out += x ?? 0 } return out };
+  const alt6 = function () { let out = 0; for (let x of check) { out += x || 0 } return out };
+  const alt7 = function () { let out = 0; for (let x of check2) { out += x ?? 0 } return out };
+  const alt8 = function () { let out = 0; for (let x of check2) { out += x || 0 } return out };
+
+  func2 = [alt1, alt2, alt3, alt4, alt5, alt6, alt7, alt8];
+  for (let fun of func2) {
+    %OptimizeFunctionOnNextCall(fun);
+  }
+  for (var i = 0; i < 100000; i++) {
+    for (let fun of func2) {
+      fun()
+    }
+  }
+  for (let fun of func2) {
+    printCurrentStatus(fun);
+  }
+  printTree()
+
+  summary(() => {
+    bench('null/1 ?? 0', alt1);
+    bench('null/1 || 0', alt2);
+    bench('undefined/1 ?? 0', alt3);
+    bench('undefined/1 || 0', alt4);
+  });
+
+  summary(() => {
+    bench('arr null/1 ?? null', alt5);
+    bench('arr null/1 || null', alt6);
+    bench('arr und/1 ?? null', alt7);
+    bench('arr und/1 || null', alt8);
+  });
+})()
+
+
+await (async function () {
+  const alt1 = function () { let out = 0; for (let x = 0; x < 100; x++) { out += (Math.round(Math.random()) ? null : 1) ?? 0 } return out };
+  const alt2 = function () { let out = 0; for (let x = 0; x < 100; x++) { out += (Math.round(Math.random()) ? null : 1) || 0 } return out };
+  const alt3 = function () { let out = 0; for (let x = 0; x < 100; x++) { out += (Math.round(Math.random()) ? undefined : 1) ?? 0 } return out };
+  const alt4 = function () { let out = 0; for (let x = 0; x < 100; x++) { out += (Math.round(Math.random()) ? undefined : 1) || 0 } return out };
+
+  func3 = [alt1, alt2, alt3, alt4];
+  for (let fun of func3) {
+    %OptimizeFunctionOnNextCall(fun);
+  }
+  for (var i = 0; i < 100000; i++) {
+    for (let fun of func3) {
+      fun()
+    }
+  }
+  for (let fun of func3) {
+    printCurrentStatus(fun);
+  }
+  printTree()
+
+  summary(() => {
+    bench('loop null/1 ?? 0', alt1);
+    bench('loop null/1 || 0', alt2);
+    bench('loop und/1 ?? 0', alt3);
+    bench('loop und/1 || 0', alt4);
+  });
+})()
+
+// Start the benchmark
+run().then(() => {
+  for (let fun of func3) {
+    printCurrentStatus(fun);
+  }
+  printTree()
+});
\ No newline at end of file
diff --git a/benchmark/string.js b/benchmark/string.js
new file mode 100644
index 0000000..b0f8fc2
--- /dev/null
+++ b/benchmark/string.js
@@ -0,0 +1,80 @@
+import { summary, run, bench } from 'mitata';
+
+// Warmup (de-optimize `bench()` calls)
+bench('noop', () => { });
+bench('noop2', () => { });
+
+// Example benchmark
+summary(() => {
+  const dataset = new Array(100).fill(0).map(
+    () => new Array(10).fill(0).map(() => String.fromCharCode(97 + Math.round(Math.random() * 22))).join('')
+  );
+  console.log(dataset)
+
+  const fn1 = (str) => (str[0] === 'c' ? 1 : 0) + (str[1] === 'c' ? 1 : 0) + (str[2] === 'c' ? 1 : 0);
+  fn1('a');
+  fn1('b');
+  fn1('c');
+  fn1('d');
+  // optimizeNextInvocation(fn1);
+  bench('Char check', () => dataset.map(fn1))
+
+  const fn2 = (str) => (str.charCodeAt(0) === 99 ? 1 : 0) + (str.charCodeAt(1) === 99 ? 1 : 0) + (str.charCodeAt(2) === 99 ? 1 : 0);
+  fn2('a');
+  fn2('b');
+  fn2('c');
+  fn2('d');
+  // optimizeNextInvocation(fn2);
+  bench('Char code check', () => dataset.map(fn2));
+
+
+  bench('2x Char check', () => dataset.map(fn1))
+  bench('2x Char code check', () => dataset.map(fn2));
+});
+
+// Example benchmark
+summary(() => {
+  let paths = [
+    'test1/',
+    'test/',
+    'test3/',
+    'test/',
+    'test5/',
+    'something/',
+    'else/',
+    'goes/',
+    'here/',
+    'too/',
+  ]
+
+  function fastCheck(str) {
+    if (str.charCodeAt(0) === 116) {
+      if (str.charCodeAt(1) === 101) {
+        if (str.charCodeAt(2) === 115) {
+          if (str.charCodeAt(3) === 116) {
+            if (str.charCodeAt(4) === 47) {
+              if (str.indexOf('/', 5) === -1) {
+                return true
+              }
+            }
+          }
+        }
+      }
+    }
+    return false
+  }
+
+  let r = new RegExp('^test/$')
+  function regexCheck(str) {
+    return r.test(str)
+  }
+
+  console.log(paths.map(fastCheck))
+  console.log(paths.map(regexCheck))
+
+  bench('fastCheck', () => paths.map(fastCheck))
+  bench('regexCheck', () => paths.map(regexCheck));
+
+});
+
+run();
\ No newline at end of file