code execution speed, which is faster?

Hi all,
A rookie question, please bear..
Currently my application code (.text, .rodata,..) resides in ext.flash
whereas data (.data, .bss,..) in ext.ram. Im wondering what's the
fastest way around for mpc555 code execution, can I relocate the
executable code sections to say int.ram or int.flash with potential
performance benefits. Any useful tips would be highly appreciated.
Thanks in advance.

Regards,
Rohit