I would check out whatever your host offers, since it's a good bet it works there.
I don't consider Websockets fast enough for action type games regularly, but if you don't want the peer to peer from the Construct multiplayer, then it should get pretty close.
If you keep your message size light, I would imagine it is. For my chat server, I am getting 10-30ms latency.
The free version has 1 update per second per item.... way too slow for an action game.
You will require the presto or vivace license.
Ah, sad days, I did not see that update limit.