Dante’s default latency compensation is 1ms: https://dev.audinate.com/GA/dante-controller/userguide/webhe...

> The typical default latency for a Dante audio device is 1 msec.

(emphasis mine)

The latency depends on the device. Hardware implementations of Dante commonly support latencies of 1ms or less, but software implementations are higher. The minimum latency of Dante Virtual Soundcard running on a PC is 4ms.

That's the appropriate number to compare against here (since the PC is using a software driver to interface with the network). However, that 4ms number is one-way latency, and the OP's 3.6ms number is round-trip. So this is already half the latency of DVS. (That being said, it sounds like this latency figure was only achieved in very ideal configurations, and we don't know the reliability/rate of late packets compared to DVS.)