gistfile1.rb

10.times do
  r = Restaurant.find(:all, :conditions => ['id IN (?)', ids])
  Restaurant.add_cuisines(r)
  r.map(&:cuisines).flatten.map(&:id)
end

# benchmarked 10 times
    user     system      total        real
3.070000   0.040000   3.110000 (  3.148139)
3.040000   0.030000   3.070000 (  3.133394)
3.060000   0.050000   3.110000 (  3.160772)
3.050000   0.040000   3.090000 (  3.178049)
3.100000   0.010000   3.110000 (  3.169859)
3.070000   0.030000   3.100000 (  3.174384)
3.120000   0.040000   3.160000 (  3.259299)
3.120000   0.030000   3.150000 (  3.238029)
3.100000   0.040000   3.140000 (  3.241258)
3.060000   0.030000   3.090000 (  3.135886)

# memory diff from baseline IRB for each run [1]
4388, 10112, 10180, 10252, 10316, 10364, 10408, 10496, 10540, 10472