Wi-Fi network speed dependent on the device with the lowest speed in this network?

Question

WiFi

More than once I came across descriptions of the "effect" of reducing the speed in the WI-FI network due to the presence of a device on the network that is connected at a low speed, mostly these were comments on what.
Last week I brought home a WI-FI camera (smart home by Rostelecom), installed it in the farthest room, made sure that there was a picture and forgot it.
Further, over the next days, I was looking for the reason for the low speed of the Internet via Wi-FI, the household found a sharp decrease in speed, having measured the speed on their smartphone, the speed was less than 0.1 Mbps in both directions. In Mikrotik, I looked at what speeds the devices were connected to - all at 54 Mbps, except for this camera, which just connected at 0.1 Mbps. Those. she "dictated" the speed threshold of the entire network. As soon as the camera was dragged closer to Mikrotik, the entire network worked as before - excellent.
I tried to google my question in Yandex, but, unfortunately, I can’t formulate what I need))
Help with a tip on this issue, preferably something official, such as an indication of this in the 802.11 standard

Answer 1

I can assume that the channel layer was clogged with broken frames from the camera, trying to establish a connection with it. Maybe interference (superposition of waves) influenced, maybe something else.
In short, the radio module was engaged only in the camera.