sv_map_download_speed
defaults to 2:
https://github.com/teeworlds/teeworlds/blob/e4ac6664c4f7450f61a55203923b3cf2d734ce14/src/engine/shared/config_variables.h#L85
Internet connections got better since, and maybe a saner default should be set. Few servers change this, even though they would benefit from doing so.
Log of the chat that sparked the issue:
Enter
is not very intuitive compared to most modern CLIs