Domain mapping increase loading time

As you might know, loading time specially on multi-site website is very important.
Otherwise no one likes to be bundle on shared server.

Your domain mapping plugin waste the majority of visitors time:
http://tools.pingdom.com/fpt/#!/eKh6ir/http://www.termeh.ca
http://tools.pingdom.com/fpt/#!/bo9OhE/http://aaa.sepid.ca/about/

Is there any way to reduce this amount?