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If you expect any outside civilizations might be hostile, wouldn't a slower frame of reference magnify the risk, both in terms of giving slower civ a disadvantage in adaptation/response times if any conflict did occur, and also in giving the faster frames more time to spawn hostile civilizations?

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It probably depends what the limits of physics actually are. If interstellar war is actually practical given the laws of nature, you might be worried about such things. Otherwise, doesn't matter.

Weapons and soldiers would be entering the same time frame, so they would have similar response times.

park your army away from the black hole and build up your weapons and drones before the battle. you could build up resources at speeds orders of magnitude greater than the black hole civ

If hostiles were conquerors, I’d think they’d send waves of robot-weapons, with extra time to make/improve successive waves.

If they were annihilists, I’d think they’d send relativistic projectiles.

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