# Performance ### Test environment * AWS EC2 [c4.xlarge](http://aws.amazon.com/ec2/instance-types/#c4) (4x E5-2666 v3 @ 2.90GHz) * Amazon Linux AMI 2016.03.1 (HVM), SSD Volume Type * Node.js v6.2.0 ### The contenders * [jimp](https://www.npmjs.com/package/jimp) v0.2.24 - Image processing in pure JavaScript. Bilinear interpolation only. * [lwip](https://www.npmjs.com/package/lwip) v0.0.9 - Wrapper around CImg, compiles dependencies from source. * [imagemagick-native](https://www.npmjs.com/package/imagemagick-native) v1.9.2 - Wrapper around libmagick++, supports Buffers only. * [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) v1.22.0 - Fully featured wrapper around GraphicsMagick's `gm` command line utility. * sharp v0.15.0 / libvips v8.3.1 - Caching within libvips disabled to ensure a fair comparison. ### The task Decompress a 2725x2225 JPEG image, resize to 720x480 using Lanczos 3 resampling (where available), then compress to JPEG. ### Results | Module | Input | Output | Ops/sec | Speed-up | | :----------------- | :----- | :----- | ------: | -------: | | jimp (bilinear) | file | file | 0.94 | 1.0 | | jimp (bilinear) | buffer | buffer | 0.98 | 1.0 | | lwip | file | file | 1.14 | 1.2 | | lwip | buffer | buffer | 1.14 | 1.2 | | imagemagick-native | buffer | buffer | 1.66 | 1.8 | | imagemagick | file | file | 5.08 | 5.4 | | gm | buffer | buffer | 5.43 | 5.7 | | gm | file | file | 5.46 | 5.8 | | sharp | stream | stream | 26.52 | 28.2 | | sharp | file | file | 28.16 | 30.0 | | sharp | file | buffer | 28.27 | 30.1 | | sharp | buffer | file | 28.42 | 30.2 | | sharp | buffer | buffer | 28.42 | 30.2 | Greater libvips performance can be expected with caching enabled (default) and using 8+ core machines, especially those with larger L1/L2 CPU caches. The I/O limits of the relevant (de)compression library will generally determine maximum throughput. ### Benchmark test prerequisites Requires both _ImageMagick_ and _GraphicsMagick_: ```sh brew install imagemagick brew install graphicsmagick ``` ```sh sudo apt-get install imagemagick libmagick++-dev graphicsmagick ``` ```sh sudo yum install ImageMagick-devel ImageMagick-c++-devel GraphicsMagick ``` ### Running the benchmark test ```sh git clone https://github.com/lovell/sharp.git cd sharp npm install cd test/bench npm install npm test ```