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Performance

A test to benchmark the performance of this module relative to alternatives.

The contenders

  • jimp v0.16.1 - Image processing in pure JavaScript. Provides bicubic interpolation.
  • mapnik v4.5.9 - Whilst primarily a map renderer, Mapnik contains bitmap image utilities.
  • imagemagick v0.1.3 - Supports filesystem only and "has been unmaintained for a long time".
  • gm v1.23.1 - Fully featured wrapper around GraphicsMagick's gm command line utility.
  • @squoosh/lib v0.4.0 - Image libraries transpiled to WebAssembly, includes GPLv3 code.
  • @squoosh/cli v0.7.2 - Command line wrapper around @squoosh/lib, avoids GPLv3 by spawning process.
  • sharp v0.30.0 / libvips v8.12.2 - Caching within libvips disabled to ensure a fair comparison.

The task

Decompress a 2725x2225 JPEG image, resize to 720x588 using Lanczos 3 resampling (where available), then compress to JPEG at a "quality" setting of 80.

Test environment

  • AWS EC2 eu-west-1 c5ad.xlarge (4x AMD EPYC 7R32)
  • Ubuntu 21.10 (ami-0258eeb71ddf238b3)
  • Node.js 16.13.2

Results

Module Input Output Ops/sec Speed-up
jimp buffer buffer 0.84 1.0
squoosh-cli file file 1.08 1.3
squoosh-lib buffer buffer 1.85 2.2
mapnik buffer buffer 3.45 4.1
gm buffer buffer 8.60 10.2
gm file file 8.66 10.3
imagemagick file file 8.79 10.5
sharp stream stream 28.90 34.4
sharp file file 30.08 35.8
sharp buffer buffer 30.42 36.2

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.

Running the benchmark test

Requires ImageMagick, GraphicsMagick and Mapnik:

brew install imagemagick
brew install graphicsmagick
brew install mapnik

sudo apt-get install build-essential imagemagick libmagick++-dev graphicsmagick libmapnik-dev

sudo yum install ImageMagick-devel ImageMagick-c++-devel GraphicsMagick mapnik-devel

git clone https://github.com/lovell/sharp.git
cd sharp
npm install --build-from-source
cd test/bench
npm install
npm test