Of course, the Giganotosaurus is a carnivore as mentioned before, and is part of the therapod genus.

It is theorised that it hunted for any animals smaller then it, like juvenile sauropods. 
However as you say, it was so big the top speed of the animal is thought to be limited. A way to mitigate this disadvantage might have been by hunting in packs. This would also make it possible for the Giganotosaurus to take down prey larger then itself.

It went extinct around 97 milion years ago, and lived in what we now call Argentina.
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