Yea there is a slowdown, but its not due to FPS getting lower with whatever zoom you have with your install. I fx. have downsized the zoom in my GWX to 1,5 and 6 for the attack and 1 and 4 for the obs. while leaving the binocular at GWX default. UZO is at x7.
IMO the slowdown (or better explained as slower rotational movement) is due to the usual necessity of finetuning the scope while zoomed in. Then if you need to swing the scope around, say 120 deg, you zoom out and rotate, then zoom in and fine tune.
To me this does not look like a bug.
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