Does anybody know what the throughput is when connecting the firestick through the ethernet adaptor?
Wifi gives me 37Mb/sec but ethernet is 27Mb/sec. Normally ethernet would be faster.
There are no specs for it. 27 mbps is plenty fast enough for 4K.
ethernet gives you direct access to the internet leaving the wifi free. - and eliminating any interference. The speed depends upon your connection to the sounds as if you likely have copper cable connection or are on a plan to give 37 as the maximum speed. Lower speed package are usually subject to a higher contention ratio (number of connections on one line and is typically starting at 20 connections)
Is your ethernet direct to the router or via a switch - passive or active?