This error indicates that your connection speed if lower than the minimal one required: 1 Mbps.
Make sure that your network meets the minimal system requirements.
Possible reasons:
insufficient connection speed,
a huge load on the network,
too many simultaneous processes using the same bandwidth,
unstable connection (mobile internet, Wi-Fi) or a break on the provider side.
Perform the following steps:
Check the connection speed. The minimal speed is 1 Mbps, the recommended one is 5 Mbps.
Reload the router or connect an ethernet cable to your computer. If it does not help, try changing the access point.
Switch to a wired connection instead of Wi-Fi.
Close other programs that use the same connection and load the same bandwidth.
Try use of a browser with all extensions disabled.
Ask other users to disconnect from the same network, if possible.