Yeah the freezing idea is a good one...
A cap would be wise for that... And maybe buildings can get frozen like once a week or something? Cause even with a cap, if it's unfrozen, you just launch a new fleet and freeze em up again.. Would be rather nasty
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'As the angels fall down from the heaven, the Heart Of Darkness looks and laughs, for his time has come'
~Seraphim, the Heart Of Darkness