hi
i have external squid which series connected with mikrotik i.e
internet====squid======MT=====clients
i want to do:
1. internet to clients is limited.
2. cache to clients is full speed.
how does make that plz.

http://wiki.mikrotik.com/wiki/Queue_wit ... _Web-Proxy

The article above applies if you use your mikrotik box for cache as well, but I see you have squid for cache.
Tinker with the settings a bit see if you can apply it to your scenario.