diff --git a/package.json b/package.json
index 9d6cf27..b4a4861 100644
--- a/package.json
+++ b/package.json
@@ -44,6 +44,7 @@
     "ipfs-unixfs-exporter": "~0.35.4",
     "ipld": "~0.20.2",
     "multihashes": "~0.4.14",
+    "pull-buffer-stream": "^1.0.1",
     "pull-generate": "^2.2.0",
     "pull-traverse": "^1.0.3",
     "sinon": "^7.1.0"
diff --git a/test/benchmark.spec.js b/test/benchmark.spec.js
new file mode 100644
index 0000000..992bf60
--- /dev/null
+++ b/test/benchmark.spec.js
@@ -0,0 +1,87 @@
+/* eslint-env mocha */
+'use strict'
+
+const importer = require('../src')
+
+const chai = require('chai')
+chai.use(require('dirty-chai'))
+const expect = chai.expect
+const pull = require('pull-stream/pull')
+const values = require('pull-stream/sources/values')
+const onEnd = require('pull-stream/sinks/on-end')
+const IPLD = require('ipld')
+const bufferStream = require('pull-buffer-stream')
+
+const REPEATS = 10
+const FILE_SIZE = Math.pow(2, 20) * 500 // 500MB
+const CHUNK_SIZE = 65536
+
+describe.skip('benchmark', function () {
+  this.timeout(30 * 1000)
+
+  let ipld
+
+  before((done) => {
+    IPLD.inMemory((err, resolver) => {
+      expect(err).to.not.exist()
+
+      ipld = resolver
+
+      done()
+    })
+  })
+
+  const times = []
+
+  after(() => {
+    console.info(`Percent\tms`)
+    times.forEach((time, index) => {
+      console.info(`${index}\t${parseInt(time / REPEATS)}`)
+    })
+  })
+
+  for (let i = 0; i < REPEATS; i++) {
+    it(`run ${i}`, (done) => { // eslint-disable-line no-loop-func
+      this.timeout(0)
+
+      const size = FILE_SIZE
+      let read = 0
+      let lastDate = Date.now()
+      let lastPercent = 0
+
+      const options = {
+        progress: (prog) => {
+          read += prog
+
+          const percent = parseInt((read / size) * 100)
+
+          if (percent > lastPercent) {
+            times[percent] = (times[percent] || 0) + (Date.now() - lastDate)
+
+            lastDate = Date.now()
+            lastPercent = percent
+          }
+        }
+      }
+
+      const buf = Buffer.alloc(CHUNK_SIZE).fill(0)
+
+      pull(
+        values([{
+          path: '200Bytes.txt',
+          content: bufferStream(size, {
+            chunkSize: CHUNK_SIZE,
+            generator: (num, cb) => {
+              cb(null, buf)
+            }
+          })
+        }]),
+        importer(ipld, options),
+        onEnd((err) => {
+          expect(err).to.not.exist()
+          done()
+        })
+      )
+    })
+  }
+})
diff --git a/test/no b/test/no
new file mode 100644
index 0000000..774d155
--- /dev/null
+++ b/test/no
@@ -0,0 +1,93 @@
+/* eslint-env mocha */
+'use strict'
+/*
+try {
+  require('@achingbrain/appmetrics-dash').monitor()
+} catch (error) {
+  console.error(`💥 Enabling profiling failed`, error) // eslint-disable-line no-console
+}
+*/
+const importer = require('../src')
+
+const chai = require('chai')
+chai.use(require('dirty-chai'))
+const expect = chai.expect
+const pull = require('pull-stream/pull')
+const values = require('pull-stream/sources/values')
+const onEnd = require('pull-stream/sinks/on-end')
+const IPLD = require('ipld')
+const bufferStream = require('pull-buffer-stream')
+
+const REPEATS = 10
+const FILE_SIZE = Math.pow(2, 20) * 500 // 500MB
+const CHUNK_SIZE = 65536
+
+describe.skip('benchmark', function () {
+  this.timeout(30 * 1000)
+
+  let ipld
+
+  before((done) => {
+    IPLD.inMemory((err, resolver) => {
+      expect(err).to.not.exist()
+
+      ipld = resolver
+
+      done()
+    })
+  })
+
+  const times = []
+
+  after(() => {
+    console.info(`Percent\tms`)
+    times.forEach((time, index) => {
+      console.info(`${index}\t${parseInt(time/REPEATS)}`)
+    })
+  })
+
+  for (let i = 0; i < REPEATS; i++) {
+    it(`run ${i}`, (done) => {
+      this.timeout(0)
+
+      const size = FILE_SIZE
+      let read = 0
+      let lastDate = Date.now()
+      let lastPercent = 0
+
+      const options = {
+        progress: (prog) => {
+          read += prog
+
+          const percent = parseInt((read / size) * 100)
+
+          if (percent > lastPercent) {
+            times[percent] = (times[percent] || 0) + (Date.now() - lastDate)
+
+            lastDate = Date.now()
+            lastPercent = percent
+          }
+        }
+      }
+
+      const buf = Buffer.alloc(CHUNK_SIZE).fill(0)
+
+      pull(
+        values([{
+          path: '200Bytes.txt',
+          content: bufferStream(size, {
+            chunkSize: CHUNK_SIZE,
+            generator: (num, cb) => {
+              cb(null, buf)
+            }
+          })
+        }]),
+        importer(ipld, options),
+        onEnd((err) => {
+          expect(err).to.not.exist()
+          done()
+        })
+      )
+    })
+  }
+})