Just to update on the situation, I took FD_RLT's advice and compressed everything with X64 Binaries, and used X86 Binaries for decompression, and there's visibly no changes in decompression speed whatsoever between the two, and everything worked out like a charm.
I thank each and everyone of you for your input, and also Felice2011 and RamiroCruzo, whom I have pestered via PM!
I have one last question though, what's the difference in Srep m3f and m5f? Is there an advantage in using Srep m3f over m5f?