Perf improvement

I'm seeing this in validate bytes allocated value is too low: (If this is because you have improved GHC, please update the test so that GHC doesn't regress again) Expected T5837(normal) bytes allocated: 56782344 +/-7% Lower bound T5837(normal) bytes allocated: 52807579 Upper bound T5837(normal) bytes allocated: 60757109 Actual T5837(normal) bytes allocated: 52424864 Deviation T5837(normal) bytes allocated: -7.7 % *** unexpected stat test failure for T5837(normal) Does anyone else? Simon