dturner, We don't have any documented recommendations for the max deployments or clusters. Anecdotally, I've heard of 100+ clusters. Director does the most work when bootstrapping/updating/terminating clusters and less when just monitoring clusters. You are also running on a way larger instance than we usually use so I bet there's room for some tuning if you do run into issues (e.g., increasing memory, threadpools, etc).
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