I wonder about whether there are differences in performance when it comes to encoding as well. For example, I discovered in the early 90's that you could tell t

I wonder about whether there are differences in performance when it comes to encoding as well. For example, I discovered in the early 90's that you could tell the difference between Borland and Microsoft compiled binaries by how they encoded things like ADD AX,BX. I made a list of all such opcodes and made an encryption engine that simply used XOR to switch between encodings so each encryptor looked different. But I never did any timing or other performance tests on it to see if there were other differences than just the binary representation.