On yum just edit the /etc/yum.conf and add the following lines(for example if you want to limit the speed to 150 Kilobytes).

 

 

throttle

Enable bandwidth throttling for downloads. This option can be expressed as a absolute data rate in bytes/sec. An SI prefix (k, M or G) may be appended to the bandwidth value (eg. '5.5k' is 5.5 kilobytes/sec, '2M' is 2 Megabytes/sec).

Alternatively, this option can specify the percentage of total bandwidth to use (eg. '60%'). In this case the bandwidth option should be used to specify the maximum available bandwidth.

 

 

 

[참고] http://www.gnutoolbox.com/download-limit-yum-aptget/