@tyrannical no not all textures are compressed, and yes blu rays have slower access speed but thats the reason for the install, it takes the uncompressed textures and audio puts them on the hard drive so it doesnt have to wait,
and also Uncharted2 uses the unreal engine and naughty dog just offloaded the GPU calculations to the SPU's it just takes time changing the code, which is why i think the devs just get lazy or dont care enough, not only that but naughty dog had to use the assembly language to actually task it efficiently








