Older Wi-Fi access points (e.g., routers) only use Single User MIMO technology. Here, Wi-Fi end devices are only supplied with data streams one after the other and the Wi-Fi network is restricted.
The majority of all currently available Wi-Fi access points (e.g., routers) only have Single-User MIMO technology, which only supplies all Wi-Fi-capable end devices with data one after the other. If several Wi-Fi clients such as smartphones, tablets, etc. are in use, the speed of data transmission on all end devices is noticeably curtailed.
This can be remedied by using Multi-User MIMO technology, as used in current devolo Magic devices, among others.