diff --git a/docs/performance.md b/docs/performance.md
index 57dd23fd..6ec1dc55 100644
--- a/docs/performance.md
+++ b/docs/performance.md
@@ -3,18 +3,17 @@
 ### Test environment
 
 * AWS EC2 [c4.xlarge](http://aws.amazon.com/ec2/instance-types/#c4)
-* Ubuntu 15.04
-* Node.js 0.12.7
-* libvips 8.0.2
-* liborc 0.4.22
+* Amazon Linux AMI 2015.09
+* Node.js v4.1.2
 
 ### The contenders
 
-* [lwip](https://www.npmjs.com/package/lwip) 0.0.7 - Wrapper around CImg, compiles dependencies from source
-* [imagemagick-native](https://www.npmjs.com/package/imagemagick-native) git@45d4e2e - Wrapper around libmagick++, supports Buffers only.
-* [imagemagick](https://www.npmjs.com/package/imagemagick) 0.1.3 - Supports filesystem only and "*has been unmaintained for a long time*".
-* [gm](https://www.npmjs.com/package/gm) 1.18.1 - Fully featured wrapper around GraphicsMagick's `convert` command line utility.
-* sharp 0.11.0 - Caching within libvips disabled to ensure a fair comparison.
+* [jimp](https://www.npmjs.com/package/jimp) v0.2.8 - Image processing in pure JavaScript.
+* [lwip](https://www.npmjs.com/package/lwip) v0.0.8 - Wrapper around CImg, compiles dependencies from source.
+* ~~[imagemagick-native](https://www.npmjs.com/package/imagemagick-native)~~ - Wrapper around libmagick++, supports Buffers only. Does not currently work with Node.js v4.
+* [imagemagick](https://www.npmjs.com/package/imagemagick) v0.1.3 - Supports filesystem only and "*has been unmaintained for a long time*".
+* [gm](https://www.npmjs.com/package/gm) v1.20.0 - Fully featured wrapper around GraphicsMagick's `convert` command line utility.
+* sharp v0.11.3 / libvips v8.1.0 - Caching within libvips disabled to ensure a fair comparison.
 
 ### The task
 
@@ -22,19 +21,20 @@ Decompress a 2725x2225 JPEG image, resize to 720x480 using bilinear interpolatio
 
 ### Results
 
-| Module             | Input  | Output | Ops/sec | Speed-up |
-| :----------------- | :----- | :----- | ------: | -------: |
-| lwip               | file   | file   |    1.75 |        1 |
-| lwip               | buffer | buffer |    2.21 |      1.3 |
-| imagemagick-native | buffer | buffer |    7.13 |      4.1 |
-| gm                 | buffer | buffer |    7.27 |      4.2 |
-| gm                 | file   | file   |    7.33 |      4.2 |
-| imagemagick        | file   | file   |   10.04 |      5.7 |
-| sharp              | stream | stream |   23.12 |     13.2 |
-| sharp              | file   | file   |   24.43 |     14.0 |
-| sharp              | file   | buffer |   24.55 |     14.0 |
-| sharp              | buffer | file   |   24.86 |     14.2 |
-| sharp              | buffer | buffer |   24.92 |     14.2 |
+| Module      | Input  | Output | Ops/sec | Speed-up |
+| :---------- | :----- | :----- | ------: | -------: |
+| jimp        | file   | file   |    0.94 |      1.0 |
+| jimp        | buffer | buffer |    1.12 |      1.2 |
+| lwip        | file   | file   |    1.12 |      1.2 |
+| lwip        | buffer | buffer |    1.13 |      1.2 |
+| gm          | buffer | buffer |    5.50 |      5.9 |
+| gm          | file   | file   |    5.55 |      5.9 |
+| imagemagick | file   | file   |    8.66 |      9.2 |
+| sharp       | stream | stream |   16.33 |     17.4 |
+| sharp       | file   | file   |   16.88 |     18.0 |
+| sharp       | file   | buffer |   16.90 |     18.1 |
+| sharp       | buffer | file   |   16.99 |     18.1 |
+| sharp       | buffer | buffer |   17.06 |     18.1 |
 
 Greater performance can be expected with caching enabled (default) and using 8+ core machines.
 
@@ -57,7 +57,9 @@ sudo apt-get install imagemagick graphicsmagick libmagick++-dev
 
 ```sh
 git clone https://github.com/lovell/sharp.git
-cd sharp/test/bench
+cd sharp
+npm install
+cd test/bench
 npm install
 npm test
 ```