@blind spots in 3D space
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EDIT:
I could make a point that maneuverability in spacecraft is entirely dependent on the Thrust/Mass ratio as well. Larger ships with more powerful and economical drives and larger fuel reserves would probably outperform fighters.
..but then, this is Star Wars, and one really doesn't want to overthink the mechanics of it. Save that for a Traveller campaign. ;3
I would like to point out that the Millennium Falcon (which we see chasing a TIE fighter later on) can't outrun an Imperial-class Star Destroyer and when Han brags about how fast his ship is he says about outrunning "big Corelian ships", so at least the original idea was that bigger = faster (not agile tho, but that's another matter).
Or Han was just being a lying braggart...
In red circle we can see that turret is aligned with hull. Also note that gunners window is aligned FORWARD.
In this shot after Rey crashed into ground we can see maximum rotation of the turret without rotating whole mechanism. So we can assume this was maximum rotation for ultra fast moves, that caused those clanks that cause this discussion.