The big difference between SH3 and SH4 is that SH4 has "dynamic loading". It only loads assets that it has to for the immediate roughly 32nm radius around the player's sub, and the campaign files based upon date. Hence, the "efficiency" of starting the game... The "bandwidth" of the actual game engine is the same though, so anything too busy around the player lags just as much in SH4 as it does in SH3, as the game tries to keep up with the world around the player...
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