Why is the speed of the Internet less than presented through Wi-Fi?

Question

Computer networks

I recently installed a 100mb tariff from a regional provider. With a tariff of 15 mb, the download speed was 1 mb. Recently, I began to notice that wi-fi does not even give 2mb, at a rate of 100mb. And if you connect the cable directly to the laptop, then the download speed of the file is 9-10mb.
Yes, immediately say that the router is to blame. But it has a bandwidth of 150MB. Router: TL-WR741N . What could be the problem? Why is the Internet speed so weak if connected. via wifi

Answer 1

But it has a bandwidth of 150mb

150 Mbps is one way. And since you have two-way Wi-Fi, we boldly divide in half and get 75 Mbps in ideal laboratory conditions. If another device connects, then we divide the channel by two more.
Also, you must remember that 1 byte = 8 bits. When the computer jumps, it shows in Bytes. And so 1m Byte = 8 Mbps
Now to your problems. Your neighbors on the right, left, bottom also have Wi-Fi, and if you are on the same channel with them, then they jam you. Put on your mobile phone - Wifi Analyzer and find the most loaded channel. It is considered correct that the distance between the channels should be two channels. That is, if there is a strong signal from the neighbor on channel 5, then go two or three channels to the left or right.
Determine which channel is more free
Remove "AUTO"

Answer 2

What could be the problem? Why is the Internet speed so weak if connected. via wifi

You would bother to specify the characteristics of the equipment to begin with. Model, standard, settings.
Not the fact that the equipment allows more.
In general, the speed seems to be quite good if the files are downloaded at a speed of 2 megabytes.

Answer 3

Turn off encryption on the wireless interface and the speed will rise.
Another person fell for the bait of marketing.
Z.Y. And the WR741N itself will not extend the connection to 100 megabits.

Answer 4

you need to understand that you need not only a router with support for high speeds, but also an adapter on your computer. if the card on the computer supports only the 802.11g standard, more than 25 Mbit / s will not work in any way

Answer 5

The maximum speed is always measured by the maximum bandwidth of the narrowest section.
Wi-Fi is not famous for its high bandwidth, most devices only support BGN standards, which is almost always 54Mbit / s, the number of devices on the network and the number of networks on the air also affect the speed of the Wi-Fi connection, in addition to this, there are other interferences that interfere with the signal.
Therefore, Wi-Fi is more of an interface for convenience, since it is wireless, but it does not guarantee the maximum transmission speed, and it is more likely to pull the declared 100 over cable, since there is less interference and greater standardization of devices.
If you want high speeds on Wi-Fi, then switch all devices to 5 GHz, then you can talk about speeds.