As we know that 90% of people have Wifi at a low speed due to this they were unable to download or upload at a high speed. But in some cases, the Given speed from the ISP also didn't
get transmitted from the wifi.

 


For example, ISP is giving 10Mbs speed but the router transmits only 6 Mbps. 

there are various ways to boost the speed of Wifi but these do not increase the maximum speed i.e above 10 Mbps in the above case. It can also boost only the transmitting speed i.e. 6 Mbps to 10Mbps in the above case.

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Why Your Wi-Fi Is Slow
There are many possible reasons for slow connection speed. Physical barriers, such as walls and floors, can affect wireless signals. The distance between the device and the access point and the number of devices using your Wi-Fi network will also impact the conn
ection speed. Even simple things like adjusting the height of your router off the floor can impact its performance.

Be sure to talk with your Internet service provider to make sure you’re paying for the speed you need. Different providers offer different speeds, and you may not have the package that is the best fit for your connectivity needs.
Three main factors impact the speed of your Internet connection—the placement of the router, the technology, and the devices that are connected to it
.

Why does the wifi slow down when I connect my phone to it? - Quora

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Follow the following points to boost the speed

#1 Remove unnecessary connection i.e turn off the wifi of devices that aren't in use.

#2 Place the Wifi at a better location where it is close to you prefer to an open spot area where there are no interceptions.

#3 Update the firmware of the router from trusted sources.

Update your router firmware to fix internet connection woes - CNET

#3 Use LAN cables if you are using a laptop and computer.

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Other Tips

1. Use a wireless range extender.

2. Add access points.

3. Speed up the data stream.

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