The yum-fastestmirror package provides a Yum plugin which measures the speed of available mirrors and sorts the list so that priority is given to the fastest mirrors; this can result in faster yum operations and reduced network congestion -- and with no additional manual effort beyond installing the plugin.
Installing from the command line: # yum install yum-fastestmirror
One may exclude certain domains from even being listed at all by adding the following line to /etc/yum/pluginconf.d/fastestmirror.conf:
exclude=.tw, .jp
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source:http://linuxpoison.blogspot.com/2009/04/13578175714365.html