Difference between older Extreme and new one

I have an Airport Extreme that is about 2 to 3 years old.  The difference between speed when I am plugged by ethernet into the network and when I am using the router is significant.  It drops by about 50% or more.
Can I expect better performance from a new model?  I have mine set at 5GHZ and auto for Channel selection.
Thanks,
Deanna

The new AirPort Extreme 802.11ac......which is really not so new.....can produce wireless signals theoretically approaching the same speed as an Ethernet connection......but.....and this is a big BUT......this speed will only be realized with the 802.11ac AirPort Extreme....IF....
You also have a new Mac that is capable of receiving an 802.11ac signal....
and....
The Mac is located where it has line of sight with the 802.11ac AirPort Extreme.
To be realistic, if you have a good connection with the new 802.11ac AirPort Extreme and the new Mac is located such that it has line of sight with the AirPort Extreme, you might expect to see a 25% drop in speed compared to the 50%+ that you see now.
The current AirPort Extreme will be two years old in a few months, and Apple rarely keeps a current model for two years, so there may be a hint in there.

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