Dips at checkpoints are something that happens on most games, if you think games maintain silky smooth frame rate when loading data you are dead wrong, hell you could have a $6000 gaming PC and a screen showing nothing but a spinning loading icon is doing to stutter and pause regardless, that's why most use loading bars because stutters in bars are less noticeable.
As for slowdown during heavy effects, that's going to happen on both versions.
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