Profile Jekyll Build with ruby-prof

_profile_jekyll.rb

require "jekyll"
require "ruby-prof"

result = RubyProf.profile do

  # you can set any of the --options you'd pass to build here
  # it will automatically pick up the _config.yml file in source
  options = {
        "source"      => './',
        "destination" => './_site',
        "watch" => true,
        "verbose" => true
      }

  # with watch on, just ctrl+c to cancel the watch and safe profiling results
  Jekyll::Commands::Build.process(options)
end

# three forms of profiles! see the ruby-prof docs for details
# https://ruby-prof.github.io/#reports
stack_printer = RubyProf::CallStackPrinter.new(result)
flat_printer = RubyProf::FlatPrinter.new(result)
graph_printer = RubyProf::GraphHtmlPrinter.new(result)

File.open("_profile_stack.html", 'w') { |file| stack_printer.print(file) }
File.open("_profile_flat.txt", 'w') { |file| flat_printer.print(file) }
File.open("_profile_graph.html", 'w') { |file| graph_printer.print(file) }