Use FasterCSV for Dataset#to_csv

gistfile1.rb

module Sequel
  class Dataset
    def to_csv(file_name, mode, opts = {})
      n = naked
      cols = n.columns
      FasterCSV.open(file_name, mode, opts) do |csv|
        csv << cols
        n.each{|r| csv << cols.map{|c| r[c]}}
      end
    end
  end
end