TEST SAMPLE 1 = 100mb of random Photos
Precomp 0.45 x86 optimized build
Install Started - 14:44:37.31
Install Finished - 14:45:42.12
Total = 65 seconds
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Precomp 0.45 x64 optimized build
Install Started - 14:46:38.97
Install Finished - 14:47:38.42
Total = 60 seconds
Approx speed comparison x64 was 9,2% faster

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Precomp 0.44 original Build
Install Started - 14:50:05.75
Install Finished - 14:51:09.70
Total = 64 seconds
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TEST SAMPLE 1 = 115mb of 7z files
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Precomp 0.44 original Build
Install Started - 14:54:18.04
Install Finished - 14:55:01.72
Total = 43 seconds
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Precomp 0.45 x64 optimized build
Install Started - 14:55:59.44
Install Finished - 14:56:42.13
Total = 43 seconds
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Precomp 0.45 x86 optimized build
Install Started - 14:59:31.22
Install Finished - 15:00:15.10
Total = 44 seconds
Seems we have a winer
Method used was same on those 2 test samples, -mprecomp+srep+xz
i made this for you Felice

please read this carefully and let me know what you think
i had some time today so i tested the precomp 0.45