With the Blur operation in GraphicsMagick, DragonEgg fell behind GCC but was still not in bad shape as LLVM/Clang. GCC 4.6.0 was stronger than GCC 4.5.2 on the Core i3 2100 and Core i7 990X systems. This is due to Clang not currently supporting OpenMP.
The OpenSSL performance was unaffected by the compiler. OpenSSL's performance is rarely impacted by software changes as many past tests have also shown.