Keep-alive vs new TCP connection each time

benchmark.rb

require "excon"
require "benchmark"

n = 10000

Benchmark.bm(30) do |benchmark|
  benchmark.report("reuse connection") do
    client = Excon.new("http://localhost:8080", persistent: true)

    n.times do
      client.get(path: "/")
    end
  end

  benchmark.report("open new connection each time") do
    n.times do
      Excon.get("http://localhost:8080/")
    end
  end
end

result.txt

                                     user     system      total        real
reuse connection                 9.080000   5.310000  14.390000 ( 34.927759)
open new connection each time   13.800000  14.900000  28.700000 ( 71.979245)

server.rb

require 'rack'

app = Proc.new do |env|
  current_time = Time.new
  response_body = "Current time is #{current_time}"

  [
    '200',
    { 'Content-Type' => 'text/html' },
    [response_body]
  ]
end

Rack::Handler::WEBrick.run app