Gravity effects from units such as the Gravity Guardian, Gravity Drains, and Gravity Defense posts are almost delayed in my experience. Sometimes it doesn't change a battle's outcome, but much more often it does. I can tell you as a blitzing nenzul user that you most certainly can, through user trickery. But the AI does so as well. How they do so, I do not know.
A documented example: Nenzul younglings are often defeated through attrition if you slow them down. Gravity Defenses, with millions of HP with turret armor, seemed perfect to defend the hoards. But moments after the picture below is shown, the units blow through the guard post line. Most were eventually stopped, but they were well within firing distance of the turrets despite the turrets on paper able to delay them twice outside their range, making the turrets having an effective range of half what they claimed. This alone is distressing, but many units that followed this initial group blowed through the guardians completely, which feels very wrong. I felt the 5k I spent on gravity defenses should have slowed down the nenzul much earlier. Other, slower units still suffer a great delay, so the gravity's strongest defense of delaying units out of range is greatly diminished.
I attached the game file. If you pause immediately, warp to the planet on the most left on the galaxy view the event occurs right at the station.
I am strongly considering putting this up on mantis, but I was not sure if this is viewed as a problem and/or has been addressed beforehand.
