The issue with wifi is that several other systems are using your wifi also and will cut into your bandwidth,
Even the people next door to you can bugger up your signal. Going direct from the router gives you a constant bandwidth at the speed With no interference. Test it and see for yourself. You’re going to see a difference.
Memory and gpu are of big importance in X-plane. Even more so with 11.40.
Do not install the beta until they get the bugs out though.