items = 1000.times.map { |i| {id: "quick? or slow?"}}

time = Time.now
json.array! items do |item|
  json.partial! 'partial_perf/item', item: item
end
puts "time of iteration a partial: #{Time.now - time}"

time = Time.now
json.array! items do |item|
  json.id item[:id]
end
puts "time of iteration an array: #{Time.now - time}"


# time = Time.now.getutc
# json.partial! 'partial_perf/item', collection: items, as: :item
# puts "#{Time.now - time}"


time = Time.now.getutc
json.array! items do |item|
  json.cache! item do
    json.partial! 'partial_perf/item', item: item
  end
end
puts "time of iteration a cache partial:  #{Time.now - time}"


# time = Time.now.getutc
# json.cache! items do
#   json.partial! 'partial_perf/item', collection: items, as: :item
# end
# puts "#{Time.now - time}"