What are the specs to your computer? (add your Hard Drive info)
Sounds like something is not up to par and causing your alts to lag out.

Try, logging into just 2 or 3 of your guys see if that lag happens. Then try 4, if it works but not on a 5th person then your computer cannot handle 5 very well.

Are your using Keyclone? Yse maximizer that way you can really see if your toons are falling behind.