you know it's a memory stick read/write speed problem, right?
if you have a fast brand name micro sd (even if small, just needs to fit PoR), try it with that.
I bought a transcend 8gb class6 (class6! important! it's a little more expensive, but makes game play much more enjoyable. less loading time, fast boot up, less/no lag in some laggy games...etc.)
and played PoR without any problem until the end!
about the patch, though. I do remember seeing what DeltaBladeX said. but idk where x(
There has been a new graphic patch release for Castlevania Portrait of Ruin on romhacking.net. http://www.romhacking.net/hacks/4839/
It´s called Castlevania Portrait of Elegance and replaces the anime style artwork with a more gothic style closer to the Castlevania series.