Ограничение скорости wget'a

--limit-rate=amount
Limit the download speed to amount bytes per second. Amount may be
expressed in bytes, kilobytes with the k suffix, or megabytes with
the m suffix. For example, --limit-rate=20k will limit the
retrieval rate to 20KB/s. This is useful when, for whatever rea-
son, you don't want Wget to consume the entire available bandwidth.