Testing Perl 5.012002, Moose 1.24, Mouse 0.91, Moo 0.009007, Object::T
+iny 1.08, Object::Tiny::XS 1.01
Benchmark: timing 6000000 iterations of Moo, Moo w/quote_sub, Moose, M
+ouse, Object::Tiny, Object::Tiny::XS, hash, manual, manual with no ch
+ecks...
Object::Tiny::XS:  1 secs ( 1.20 usr + -0.01 sys =  1.19 CPU) @ 504201
+6.81/s
hash, no check  :  3 secs ( 1.86 usr +  0.01 sys =  1.87 CPU) @ 320855
+6.15/s
Mouse           :  3 secs ( 3.66 usr +  0.00 sys =  3.66 CPU) @ 163934
+4.26/s
Object::Tiny    :  3 secs ( 3.80 usr +  0.00 sys =  3.80 CPU) @ 157894
+7.37/s
hash            :  5 secs ( 5.53 usr +  0.01 sys =  5.54 CPU) @ 108303
+2.49/s
manual, no check:  9 secs ( 9.11 usr +  0.02 sys =  9.13 CPU) @  65717
+4.15/s
Moo             : 17 secs (17.37 usr +  0.03 sys = 17.40 CPU) @  34482
+7.59/s
manual          : 17 secs (17.89 usr +  0.02 sys = 17.91 CPU) @  33500
+8.38/s
Mouse no XS     : 20 secs (20.50 usr +  0.03 sys = 20.53 CPU) @  29225
+5.24/s
Moose           : 21 secs (21.33 usr +  0.03 sys = 21.36 CPU) @  28089
+8.88/s
Moo w/quote_sub : 23 secs (23.07 usr +  0.04 sys = 23.11 CPU) @  25962
+7.87/s
[download]

Mouse(::XS) is probably what you want: Source. Depending on how deep you want to go with Roles and Traits it’s nearly identical code-wise. This is your benchmark with a Mouse addition–

                    Rate     moose        mo     mouse blessed_hashref
+   hashref
moose            55157/s        --      -22%      -67%            -86%
+      -88%
mo               71023/s       29%        --      -58%            -82%
+      -85%
mouse           168919/s      206%      138%        --            -56%
+      -65%
blessed_hashref 384615/s      597%      442%      128%              --
+      -20%
hashref         478469/s      767%      574%      183%             24%
+        --
[download]