Firstly, both the PS4 and Vita requires a good connection. I heard both should receive above 3 upload, and a ping below 30ms. (Don't take my word for it). I have a Home hub 5 which I think is pretty much the same, buy the Home Hub 4 uses an Open reach modem. So firstly, what you want to do is to give your PS4 a static IP. Just some other stuff I'd say if your using WiFi on PS4, keep it at a high signal strength, of around 95% above, but that's if your unable to wire it. If you can wire it then I'll recommend you do that.