Comparing open from disk to open-uri

benchmark_open.rb

require "benchmark"
require "open-uri"
require "pathname"

n = 1_000

Benchmark.bm do |benchmark|
  benchmark.report("open(url).read") do
    n.times do
      open("http://localhost:3035/packs/manifest.json").read
    end
  end

  benchmark.report("Pathname.new(path).read") do
    n.times do
      Pathname.new("./public/packs/manifest.json").read
    end
  end
end

On my machine (MacBook Pro, 15", mid 2014, 2.8 GHz Quad-Core Intel Core i7):

       user     system      total        real
open(url).read  0.497777   0.269930   0.767707 (  6.950559)
Pathname.new(path).read  0.009915   0.020251   0.030166 (  0.031719)