Also, is there a specific reason you have enabled no-mac-learning for the VLAN/bridge-domain? For this config option there should never be drops due to SA or DA, as they should be ignored. The drops must be for some other reason. Potentially since everything in that VLAN/bridge-domain is now a flood, if you input line-rate on say 2 interfaces, out 1 interfaces, you should get 50% drop, as you are seeing.
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