I just got 100% on Fallout 3 and I love the game to death but it's so broken and full of bugs. There's terrible input lag, crashing, freezing and frame rate problems. If Fallout 4 is like this...God help us all.
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I'm going to guess that you have The ps3 version? Traditionally, Bethesda ports don't manage well on PlayStation. The worst was oblivion, where entire questlines were broken and no patches in sight. Xbox has it better as the games are usually pretty stable. However the only way you could get the optimum performance out of fallout or TES would be to go PC.