Well let me repost one thing I said somewhere else:
Many small things that added up:
the most imoprtant being weak GPU with broken scaller, memory in two pools, bigger OS that left system with less free RAM, Cell that was hard to program and had only one all-purpose core for 'normal' code and 6 co-processors that could only run specific code....
As one dev said:
http://gamingbolt.com/developer-explains-what-its-like-developing-for-each-console-ps3-being-the-hardest
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