Movie continuity Beerus was still heavily implied by Toriyama to be capable of destroying the Kaioshinkai, which makes up 10% of Universe 7's entirety, so he and the other God Ki tiers solo GT, who's strongest characters can only destroy several galaxies. That's assuming we're not factoring in the implication that EoGT Goku can't be damaged by any attack, which would make any DB match involving him unfair.
You could make assumptions as to the pre-Super continuity universe being far smaller due to the suggestion the mortal realm only consists of four galaxies, but that would seem like backwards logic purely for the sake of nerfing when the debate over four galaxies or quadrants being without a clear answer prior to Super confirming the latter.
It's possible GT top tiers may be faster due to Movie God tiers not having any explicit FTL feats unless believing Whis' travel speed is a result of his own power rather than simple teleportation or if scaling from filler feats such as Pure Boo ravaging a galaxy in a flashback (which I'd say is sketchy when BoG seems to be trying to emulate the manga with it's stills in the ending rather than the anime). Not that it matters though, since they don't have the power to do anything with it and what hax they have can be negated with enough raw strength (eg. San Xing Long's freezing).