The McQuarrie spider looks fantastic - it's incredibly well animated, and has a definite heft; not at all fakey fake!
I do, however, share the concern that it's somewhat distracting and perhaps clutters the frame. I think it's that the spider is there, in the open and in motion, at the start of this establishing shot - so we are immediately drawn to it. It's even somewhat moving towards camera, emerging outwards. And then, the critter remains in motion throughout the rest of the shot - so it continues to hold our attention.
An alternative composition might be, if the bottom right corner was darkened and the spider stilled. Then, when the second avian creature (nearest the camera) reaches the halfway mark of its flightpath, the spider could become mobile and creep out from the shadows. This way, when the establishing shot begins, we initially register the X-Wing, and then the flying creatures, and then the spider - it's less of a jumble, and builds effectively.
This could further justify the longer hold on this shot, too, because it makes better use of the additional time - not revealing everything at once, in the beginning, but spacing out the reveals across the length of the shot. And, the spider showing itself at the end, crawling out from the dark, could evoke a greater sense of foreboding.
Just my two pence!
- EDIT -
^ yoda1138 beat me to it, with a similar suggestion that also involved obscuring the spider's corner (albeit with mist).