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Hi, maybe someone can educate me about this. I switched ISPs and have a 400mb/s plan. I have TP LINK AC1900 Archer C9 router and TP LINK 7650 modem. The technician who set it up then connected to my wifi and did a speedtest (Xfinity speed test) and indeed got a result of DL speed of 387mb/s over wifi. I then tested with my HP Spectre 15 i7 (brand new with latest drivers and updates of everything) and I got 1.5mb/s !!
After a LOT of troubleshooting efforts, I just moved to the next room for no particular reason, just to be comfortable and change from sitting position. Then I ran the speed test again and I got ~100mb/s. Turns out that if the laptop is right next to the router, the speed is horribly slow.
I tested the same with my mobile phone and the same principle holds - if the phone is next to the router, the speed doesn't go past 1.5mb/s.
I thought it was the other way around - the farther you get from the router, the weaker the signal and you get slower speed.

Anyone has an idea what's going on?

I'm thinking the router signal interfering with the antennas of other devices if they are too close, but that just seems weird.

Other than that, I wonder how I can actually get the 400mb/s speed that I signed for on my laptop (as it's getting 100-120 at most.

Thanks