diff --git a/.idea/workspace.xml b/.idea/workspace.xml
deleted file mode 100644
index 0bd56a4..0000000
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diff --git a/README.md b/README.md
index 5945510..c4b1719 100644
--- a/README.md
+++ b/README.md
@@ -11,6 +11,7 @@ CLI & Node wrapper around [javascript replace](https://developer.mozilla.org/en-
 * [Node API usage](#node-api-usage)
 * [CLI usage](#cli-usage)
 * [Examples](#examples)
+* [Benchmarks](#benchmarks)
 
 ## Installation
 ##### yarn
@@ -226,3 +227,23 @@ FRS-replace a b --content abcd -o foo_replaced.js
 ```bash
 FRS-replace a b -i foo.js | <next-command>
 ```
+
+## Benchmarks
+#### input as glob pattern [1000 iterations x 100 repetitions]
+| Library (best&nbsp;bolded) | Execution time [s] | Difference percentage (comparing&nbsp;to&nbsp;best&nbsp;time) |
+| --- | --- | --- |
+| FRS-replace async | 0.69685816 | 319.4838% |
+| FRS-replace sync | 0.67118157 | 304.0274% |
+| replace-in-file | 1.76974941 | 965.3262% |
+| **replace async** | 0.16612277 | 0.0000% |
+| replace sync | 0.47949551 | 188.6393% |
+| replace-string | *N/A* | *N/A* |
+#### input & replacement as strings [1000 iterations x 100 repetitions]
+| Library (best&nbsp;bolded) | Execution time [s] | Difference percentage (comparing&nbsp;to&nbsp;best&nbsp;time) |
+| --- | --- | --- |
+| FRS-replace async | 0.02088436 | 119.3194% |
+| FRS-replace sync | 0.01082087 | 13.6366% |
+| replace-in-file | *N/A* | *N/A* |
+| replace async | *N/A* | *N/A* |
+| replace sync | *N/A* | *N/A* |
+| **replace-string** | 0.00952235 | 0.0000% |
diff --git a/benchmark/multiple-file-replace.spec.js b/benchmark/multiple-file-replace.spec.js
new file mode 100644
index 0000000..8c9eef0
--- /dev/null
+++ b/benchmark/multiple-file-replace.spec.js
@@ -0,0 +1,285 @@
+const tap = require('tap')
+const tmp = require('tmp-promise')
+const path = require('path')
+const fs = require('fs')
+const perfy = require('perfy')
+const glob = require('fast-glob')
+
+const FRSreplace = require('../src/replace')
+const replace = require('replace')
+const replaceInFile = require('replace-in-file')
+const replaceString = require('replace-string')
+
+const regex = new RegExp('^[adjox]', 'gm')
+const replacement = 'ą|'
+const content = `aąbcćdeęfg%hi
+jklmn
+oópqr,stuvwxyZ`
+const tmpPrefixes = {
+  input: 'FRS-replace-replace-in',
+  output: 'FRS-replace-replace-out'
+}
+const defaults = {
+  inputReadOptions: 'utf8',
+  outputWriteOptions: 'utf8',
+  inputJoinString: '\n'
+}
+const repetitionsNo = 100000
+const iterationsNo = 1000
+const testInput = {}
+const testedLibraries = [
+  'FRS-replace async',
+  'FRS-replace sync',
+  'replace-in-file',
+  'replace async',
+  'replace sync',
+  'replace-string'
+]
+
+let dir, output, input, input2
+
+const readmeContent = fs.readFileSync('./README.md').toString()
+
+let perfyResults = ''
+
+{
+  const dirObj = tmp.dirSync() // removing all files similar our tmp
+  dir = dirObj.name
+
+  glob.sync(
+    [
+      path.join(dir, tmpPrefixes.input),
+      path.join(dir, tmpPrefixes.output)
+    ].map(v => v + '*')
+  )
+    .forEach(fs.unlinkSync)
+}
+
+tap.beforeEach(async () => {
+  testInput.FRSReplace = {
+    regex,
+    replacement
+  }
+
+  testInput.replace = {
+    regex,
+    replacement
+  }
+
+  testInput.replaceAsync = {
+    regex,
+    replacement,
+    async: true
+  }
+
+  testInput.replaceInFile = {
+    from: regex,
+    to: replacement
+  }
+
+  cleanInputs()
+
+  await tmp.file({ prefix: tmpPrefixes.input, keep: true, dir })
+    .then(
+      async f => {
+        input = f
+        return new Promise(
+          (resolve) => fs.appendFile(f.path, content, { encoding: defaults.inputReadOptions }, resolve)
+        )
+      })
+  await tmp.file({ prefix: tmpPrefixes.input, keep: true, dir })
+    .then(
+      async f => {
+        input2 = f
+        return new Promise(
+          (resolve) => fs.appendFile(f.path, content, { encoding: defaults.inputReadOptions }, resolve)
+        )
+      })
+})
+
+const cleanInputs = (done) => {
+  input2 && input2.cleanup()
+  input2 = void 0
+  input && input.cleanup()
+  input = void 0
+  done && done() // to be runned either by node-tap or manually
+}
+
+tap.afterEach((done) => {
+  fs.existsSync(output) && fs.unlinkSync(output)
+  cleanInputs()
+  done()
+})
+
+tap.test(`input as glob pattern [${iterationsNo} iterations x ${repetitionsNo / iterationsNo} repetitions]`, async ct => {
+  testInput.FRSReplace.input = `${dir}\\${tmpPrefixes.input}*`
+  testInput.replaceInFile.files = `${dir}\\${tmpPrefixes.input}*`
+  testInput.replace.paths = testInput.replaceAsync.paths = [dir.replace(/\\/g, '/')]
+
+  const results = await multipleTests([
+    () => FRSreplace.async(testInput.FRSReplace),
+    () => FRSreplace.sync(testInput.FRSReplace),
+    () => replaceInFile(testInput.replaceInFile),
+    () => replace(testInput.replaceAsync),
+    () => replace(testInput.replace),
+    void 0
+  ])
+  const sortedResults = results.slice().sort(sortByNanoseconds)
+
+  ct.not(sortedResults[0].name.indexOf('FRS-replace'), -1, 'FRS-replace should be the fastest')
+
+  outputPerfy(ct, results, sortedResults[0])
+
+  ct.end()
+})
+
+tap.test(`input & replacement as strings [${iterationsNo} iterations x ${repetitionsNo / iterationsNo} repetitions]`, async ct => {
+  testInput.FRSReplace.content = content
+  testInput.regex = regex.source
+
+  const results = await multipleTests([
+    () => FRSreplace.async(testInput.FRSReplace),
+    () => FRSreplace.sync(testInput.FRSReplace),
+    void 0,
+    void 0,
+    void 0,
+    () => replaceString(content, testInput.regex, replacement)
+  ])
+  const sortedResults = results.slice().sort(sortByNanoseconds)
+
+  ct.not(sortedResults[0].name.indexOf('FRS-replace'), -1, 'FRS-replace should be the fastest')
+
+  outputPerfy(ct, results, sortedResults[0])
+
+  ct.end()
+})
+
+tap.teardown(() => {
+  fs.writeFileSync('./README.md', readmeContent.replace(/(##\sBenchmarks\s\s)[\s\S]*?(?:$|(?:\s##\s))/, '$1' + perfyResults))
+})
+
+function outputPerfy (t, testResults, best) {
+  best = best.fullNanoseconds
+
+  const result = {
+    name: t.name,
+    results: testResults.reduce(
+      (p, v) => p.push({
+        name: v.name,
+        avgTime:
+          (
+            v.fullNanoseconds === void 0
+              ? null
+              : (v.fullNanoseconds / 1000000000)
+          ),
+        avgPercentageDifference:
+          (
+            v.fullNanoseconds === void 0
+              ? null
+              : ((v.fullNanoseconds / best - 1) * 100)
+          )
+      }) && p,
+      []
+    )
+  }
+
+  t.parser.write(
+    '  ---\n' +
+    '  name: \'' + result.name + '\'\n' +
+    '  results: \n' + result.results.reduce(
+      (p, v) => p +
+      '    - name: \'' + v.name + '\'\n' +
+      '      avgTime: ' + v.avgTime + '\n' +
+      '      avgPercentageDifference: ' + v.avgPercentageDifference + '\n'
+      ,
+      ''
+    ) +
+    '  ...\n\n'
+  )
+
+  perfyResults +=
+    '#### ' + result.name + '\n' +
+    '| Library (best&nbsp;bolded) | Execution time [s] | Difference percentage (comparing&nbsp;to&nbsp;best&nbsp;time) |\n' +
+    '| --- | --- | --- |\n' +
+    result.results.reduce(
+      (p, v) => p +
+        '| ' + (v.avgTime * 1000000000 === best ? ('**' + v.name + '**') : v.name) +
+        ' | ' + (v.avgTime === null ? '*N/A*' : (v.avgTime.toFixed(8))) +
+        ' | ' + (v.avgPercentageDifference == null ? '*N/A*' : (v.avgPercentageDifference.toFixed(4) + '%')) + ' |\n'
+      ,
+      ''
+    )
+}
+
+async function multipleTests (testFns, n, iterations) {
+  const results = []
+
+  n = (n || repetitionsNo) / iterationsNo
+  iterations = iterations || iterationsNo
+
+  testFns = testFns.reduce((p, v, i) => {
+    if (v === void 0) {
+      results[i] = { name: testedLibraries[i] }
+      return p
+    }
+
+    return p.concat({ i, v })
+  }, [])
+
+  const testFnsLen = testFns.length
+
+  for (let i = 0; i < n; ++i) {
+    for (let k = 0; k < testFnsLen; ++k) {
+      const { v: testFn, i: index } = testFns[k]
+      const prevResult = results[index]
+      const result = await singleTest(testedLibraries[index], testFn, iterations)
+
+      if (!prevResult) {
+        results[index] = result
+        continue
+      }
+
+      for (let prop in result) {
+        if (result.hasOwnProperty(prop) && typeof result[prop] === 'number') {
+          prevResult[prop] += result[prop]
+        }
+      }
+    }
+  }
+
+  testFns.forEach(({ i: index }) => {
+    const result = results[index]
+
+    for (let prop in result) {
+      if (result.hasOwnProperty(prop) && typeof result[prop] === 'number') {
+        result[prop] /= n
+      }
+    }
+  })
+
+  return results
+}
+
+async function singleTest (name, test, n) {
+  n = n || repetitionsNo
+
+  perfy.start(name)
+
+  do {
+    await test()
+  } while (--n)
+
+  return perfy.end(name)
+}
+
+function sortByNanoseconds (a, b) {
+  if (a.fullNanoseconds === void 0) {
+    return b.fullNanoseconds === void 0 ? 0 : 1
+  }
+
+  if (b.fullNanoseconds === void 0) {
+    return -1
+  }
+
+  return a.fullNanoseconds - b.fullNanoseconds
+}
diff --git a/package.json b/package.json
index f93e174..998550a 100644
--- a/package.json
+++ b/package.json
@@ -42,7 +42,8 @@
     "test": "yarn test:unit --100",
     "posttest": "tap --coverage-report=html",
     "pretest:unit": "standard --fix",
-    "test:unit": "tap ./src/*.spec.js ./bin/*.spec.js -J"
+    "test:unit": "tap ./src/*.spec.js ./bin/*.spec.js -J",
+    "test:benchmark": "tap ./benchmark/*.spec.js --no-timeout"
   },
   "nyc": {
     "exclude": "**/*.spec.js",
@@ -55,7 +56,10 @@
     "camel-case-expansion": false
   },
   "devDependencies": {
+    "perfy": "^1.1.5",
     "replace": "^1.0.0",
+    "replace-in-file": "^3.4.2",
+    "replace-string": "^2.0.0",
     "standard": "^12.0.1",
     "standard-version": "^4.4.0",
     "tap": "^12.0.1",
diff --git a/src/perfy-tap.js b/src/perfy-tap.js
deleted file mode 100644
index 86bb655..0000000
--- a/src/perfy-tap.js
+++ /dev/null
@@ -1,20 +0,0 @@
-const perfy = require('perfy')
-
-module.exports = function (_tap) {
-  _tap.sub = subWrapper.bind(_tap, _tap.sub)
-  _tap.Test.prototype.sub = subWrapper.bind(_tap, _tap.Test.prototype.sub)
-
-  //
-
-  function subWrapper (originalSub, Class, extra) {
-    var args = Array.prototype.slice.call(arguments, 1)
-    const name = extra.name
-    perfy.start(name)
-
-    const promise = originalSub.apply(this, args)
-
-    promise.then(() => perfy.end(extra.name))
-
-    return promise
-  }
-}
diff --git a/yarn.lock b/yarn.lock
index 394f38d..24e701d 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -397,7 +397,7 @@ chalk@^1.1.3:
     strip-ansi "^3.0.0"
     supports-color "^2.0.0"
 
-chalk@^2.0.0, chalk@^2.1.0:
+chalk@^2.0.0, chalk@^2.1.0, chalk@^2.4.1:
   version "2.4.1"
   resolved "https://registry.yarnpkg.com/chalk/-/chalk-2.4.1.tgz#18c49ab16a037b6eb0152cc83e3471338215b66e"
   dependencies:
@@ -2673,6 +2673,10 @@ performance-now@^2.1.0:
   version "2.1.0"
   resolved "https://registry.yarnpkg.com/performance-now/-/performance-now-2.1.0.tgz#6309f4e0e5fa913ec1c69307ae364b4b377c9e7b"
 
+perfy@^1.1.5:
+  version "1.1.5"
+  resolved "https://registry.yarnpkg.com/perfy/-/perfy-1.1.5.tgz#0d629f870a34a3eb1866d3db485d2b3faef29e4b"
+
 pify@^2.0.0, pify@^2.3.0:
   version "2.3.0"
   resolved "https://registry.yarnpkg.com/pify/-/pify-2.3.0.tgz#ed141a6ac043a849ea588498e7dca8b15330e90c"
@@ -2889,6 +2893,18 @@ repeating@^2.0.0:
   dependencies:
     is-finite "^1.0.0"
 
+replace-in-file@^3.4.2:
+  version "3.4.2"
+  resolved "https://registry.yarnpkg.com/replace-in-file/-/replace-in-file-3.4.2.tgz#6d40f076ac86948e28efeb6fab73fbad5c0bfa2a"
+  dependencies:
+    chalk "^2.4.1"
+    glob "^7.1.2"
+    yargs "^12.0.1"
+
+replace-string@^2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/replace-string/-/replace-string-2.0.0.tgz#2ba068708a4a88672e93b83acdb9f865f9e323ef"
+
 replace@^1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/replace/-/replace-1.0.0.tgz#da5235cc6d64d5c3a74e4ef73b487aad0f79a74b"
@@ -3710,7 +3726,7 @@ yargs@11.1.0:
     y18n "^3.2.1"
     yargs-parser "^9.0.2"
 
-yargs@^12.0.2:
+yargs@^12.0.1, yargs@^12.0.2:
   version "12.0.2"
   resolved "https://registry.yarnpkg.com/yargs/-/yargs-12.0.2.tgz#fe58234369392af33ecbef53819171eff0f5aadc"
   dependencies: