class C1 def m; 1; end end o1 = C1.new o2 = C1.new o2.singleton_class i = 0 while i<6_000_000 # benchmark loop 2 o = (i % 2 == 0) ? o1 : o2 o.m; o.m; o.m; o.m; o.m; o.m; o.m; o.m i += 1 end