16" MacBook Pro WIFI Slow Speed Test

You might want to check to make sure that it's connecting using 5GHz and not the 2.4GHz network. WiFi can be very unpredictable and is impossible to guarantee the speed that you are going to get. If your network uses the same network name for both 2.4 and 5GHz networks then it is most likely that for some reason it is determining that your computer needs to use 2.4GHz instead of the 5GHz. The 2.4 is more prone to interference and slowdowns than the 5. I would suggest splitting the two networks so you can choose between the 2.4 and 5 manually. Once you do that, make sure your new computer is connected to 5GHz and then try your speed test again.