Does it say specifically what is not responding? The number of links should not be an issue, but without knowing more I would suggest taking a closer look at your GSA settings. Also make sure your project settings are set to use those target lists.
But if you can copy and paste the error here I'm sure someone can point you in the right direction by knowing a little more info about the problem.
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But if you can copy and paste the error here I'm sure someone can point you in the right direction by knowing a little more info about the problem.