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.
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Yea the ps3's ram units were uncool and difficult to code for. Two separate ram units.
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Yup. Most of those issues were worked around eventually but it was still tricky. The ps4 has greatly improved on this aspect, however, so I would not expect the fallout 4 port to be nearly as bad (though it might still be the worst out of the 3 simply due to bethesda's connections with microsoft).