Wi Fi slow down on Mac Book Pro

I have had excellent wireless service in my home for the past year.  I recently downloaded the most recent OSX 10.95 and the connection is incredibly slow.  I had ATT come to my home and they replaced the modem and this hasn't fixed the problem.  I am a novice.  Any suggestions please

The channels were assigned for 2.4GHz band when 11 Mbits/sec was as fast as anyone thought would be necessary. If you use 802.11n, there are at most three clear channels available (centered at 1, 6, and 11), and you have four networks visible. This frequency band also is used by baby monitors, microwave ovens, and bluetooth (but a different modulation technique).
RSSI of -41 is excellent for receive power. Transmit rate of 145Mbits/sec is really good for that band. You should not be having problems at that power and that transmit speed. But if you are not using Bluetooth, be sure to turn it off.
One way to make sure you do not have old settings being carried forward from old setups is to use:
System preferences > Network > Wi-Fi > ( Assist me ) > ( Assistant ) ...
... to set it up again from scratch, including a new "Location" with a distinctive name that says "home" to you. You want to walk away from "Automatic" or anything you set up before and start fresh. After answering the questions, you may have to click (Apply) and wait a quarter minute for results. If no joy after that try a Restart.
If you go to Starbux and it does not work there, create a new "Location" just for there, and so on. Each basket of settings will be re-established when you choose a different "Location".

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