TCP through the USB port shared with the NIC or over the buitin WiFi ?
After re-reading all the posts in this topic and looking at a WiFi benchmark for the RPi3+ I’d guess, if you are streaming the full IQ data over the WiFi link (5GHz band might be less busy) to another machine on your LAN(Local Area Network), it would probably be less than 4 MSPS maybe 2 or less. And less than that if you are sending data over the shared USB NIC, less than 2 MSPS probably 0.5 MSPS (due to the complex queue interactions of multiple devices on a shared data bus ). And that assumes that you have enough power for the LimeSDR.