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Swift Notification Throughput (Buffer overload?)

I’m running into some issues sending notifications to an iOS app—up to 5 of them every 250ms, each ~250 bytes. I appears that when all of these are active, the buffer on the iOS end fills to about 5 notifications. The peripheral notifications are posted in a batch, and increasing MAX_PDU_NUM nor decreasing the connection interval has not helped. I’m wondering if I’m missing anything on the side of iOS or Swift to increase notification throughput? I’m using iOS 14.4 on an iPhone 12 Pro Max. Thank you!