It's likely that there would be some small performance impact from enabling detailed traffic analysis but I personally haven't noticed anything. That said, my networks have a fair bit of capacity overhead so utilization isn't a noticeable problem. With basic analysis, you can see the categories of traffic but get no further breakdown. With detailed analysis, you can see a breakdown of classified traffic into destination hostnames/IP's of each flow. An example view of the detailed traffic analysis is in the image in the below link. Switch Traffic Analytics - Cisco Meraki
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