Is it? Anyone can share?
That's true if you are comparing with wired back-haul. And when it comes to dual band mesh units, and esp if u are using those old routers like AC ones, speed can quite disappointing.
Eg if you using AC68U as aimesh, your speed will likely to be
1300Mbps (5ghz) / 2 * 0.7 = 455Mbps max.
And with wireless AiMesh typical setup (factoring LOS, distance, wifi type and devices support etc), you can relatively slice off another 50% off so it will be 100-200Mbps on average. This speed is relatively good enough for household who doesn't have alot of user or devices.
As a general rule of thumb, Tri-Band should be recommended when and if one choose to do wireless Mesh. This is due to the dedicated 3rd band which is typically meant for wireless backhaul. My current XT8 setup yields me 400Mbps on average vs a AX88U + AC88U setup as you can read from my thread.
Powerline wise, i think alot of factors come into play. Eg how the power points and cable layout, esp when it comes to old flat. My experience with powerline : speed fluctuates a lot and its not as stable as triband wireless back-haul Mesh setup.
My recommendation for mesh setup is
Wired Back-haul (dual band is fine in this case) > Wireless Back-haul (using Tri-band) > Wireless Back-haul (dual band) > powerline setup
Or even a $10-$15 AC/N wifi repeater if your node usage is just chat or browsing and just ~3 users.
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