MiniMagick vs libvips benchmark (generating a 500x500 thumbnail)

results

width, imagemagick, libvips
1000,  0.129,       0.045
1500,  0.190,       0.067
2000,  0.276,       0.054
2500,  0.380,       0.068
3000,  0.498,       0.085

script.rb

require "bundler/inline"

gemfile do
  gem "image_processing"
  gem "down"
  gem "benchmark-ips"
end

require "image_processing/mini_magick" # imagemagick 7.0.8-59
require "image_processing/vips"        # vips 8.8.1
require "down"
require "benchmark/ips"
require "csv"

# disable cache
Vips.vips_cache_set_max 0

csv = CSV.new(STDOUT)
csv << ["width", "imagemagick", "libvips"]

1000.step(by: 500, to: 3000) do |source_width|
  source = Down.download("https://images.unsplash.com/photo-1549221838-126dc3ebf29f?ixlib=rb-1.2.1&q=85&fm=jpg&crop=entropy&cs=srgb&w=#{source_width}")

  result = Benchmark.ips(quiet: true) do |x|
    x.report("imagemagick (#{source_width}px)") do
      ImageProcessing::MiniMagick
        .source(source)
        .resize_to_limit!(500, 500)
    end

    x.report("libvips (#{source_width}px)") do
      ImageProcessing::Vips
        .source(source)
        .resize_to_limit!(500, 500)
    end
  end

  imagemagick_duration = 1 / result.data.first.fetch(:ips)
  libvips_duration     = 1 / result.data.last.fetch(:ips)

  csv << [source_width, "%.3f" % imagemagick_duration, "%.3f" % libvips_duration]
end