Feb 16, 2018
Hello, I bought new WiFi adapter- TP- Link AC 1750 Wireless Dual Band Gigabit Router
Archer C7. Internet speed is going really slow on my HP laptop but fast on other devices like phones other laptops and TV. I check it here: http://www.speedtest.net/

I tried literally everything.. My router location is not near any other device. I reset DNS, I use latest drivers I changed my Broadcom driver to his previous version but there was no effect so I updated it. I reset my router and laptop to their factory. I use 11th channel, 40 mHz width (I tried on 20 and auto also), my mode is 802.11 b/g/n mixed (tried g/n and n only). My Broadcom properties: bandwidth capability is 11b/g:20/40MHz (tried on 20 only also), IBSS Mode is 802.11b/g/n Auto, XPress (TM) Technology is enabled. Power Management: Allow the computer to turn off this device to save mode is not set. I called TP- Link support and they connected to my laptop through Team Viewer and checked my setting and my WiFi was slowing down again. I found that when I watch 4k, 8k vide on YouTube, have video conversation on Facebook or something else that require big amount of data my WiFi is becoming slow (2Mbps) until I reconnect. This is happening only on my Laptop. When I reconnect everything is fine until I use big amount of data and then it drops. I didn't have that problem on my old adapter. I use 2.4 Ghz on this laptop. I checked the speed from my other devices on 2.4 Ghz also

http://www.speedtest.net/result/7064783112 -fast
http://www.speedtest.net/result/7064794255 -slow (Few minutes after the fast result, haven't changed any settings)

HP ENVY 15 Notebook PC
OS: Windows 10 Home 64-bit
Microprocessor: Intel(R) Core(TM) i7-4720HQ CPU @ 2.60GHz
System memory: 8GB
Intel(R) HD Graphics 4600
Graphic memory: 2,161 MB
In Device Manager:
Broadcom BCM43142 802.11 bgn Wi- Fi Adapter
Realtek Pcle GBE Family Controller

Try connecting via Ethernet cord and see if you get the same issue. If not, then the WiFi card may be going and need replacing. Even if the Ethernet port acts the same, it could still be that the card needs replacing. Should that be the case, then you will have to decide if you want to have the internal one replaced or use an external one that connects via a USB port.

NOTE: If the device is under warranty still, then contact the manufacturer.
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