curl-w32/docs/cmdline-opts/speed-limit.md

c	SPDX-License-Identifier	Long	Short	Arg	Help	Category	Added	Multi	See-also	Example
Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.	curl	speed-limit	Y	<speed>	Stop transfers slower than this	connection	4.7	single	speed-time limit-rate max-time	--speed-limit 300 --speed-time 10 $URL

--speed-limit

If a transfer is slower than this set speed (in bytes per second) for a given number of seconds, it gets aborted. The time period is set with --speed-time and is 30 seconds by default.