Just a little script to time page requests (no assets, just the single URL). It runs via /usr/bin/ruby which is present on all macs and most posix systems these days. If you're using rvm you'll probably want to change that.

pageTimer.rb

#!/usr/bin/ruby

$url = ARGV[0]
$rounds = ARGV[1] || 10

loadTimes = []
puts "fetching page #{$rounds} times ..."
$rounds.to_i.times do 
  print "."
  loadTimes << (`curl -w '%{time_total}\n' -o /dev/null -s "#{$url}"`).to_f
end
puts "... average request time: #{loadTimes.inject{ |sum, el| sum + el }.to_f / loadTimes.size}"