I have an existing, stable, working software project which currently uses Tyrus for the websocket client side, and Undertow 2.2.2 (Wildfly) for the server side. I'm able to get about 90% of the maximum connection speed when using these respective libraries, which is plenty fast for my needs.
The problem occurred when switching the client to also use Undertow. I was forced to modify my ByteBuffers to be much larger in size to compensate for the increased overhead that Undertow websockets have compared to Tyrus. Without modification, my throughput was dropping to about 30%.
Is there any way to tune Undertow to not perform slowly when sending small frequent ByteBuffers?
Technical details: ByteBuffer size was about 256 bytes with Tyrus. Had to increase to 4096 for Undertow to match performance. Throughput at full speed is about 10 MB/s on my current hardware.