Some of moderators on forum say that webproxy is based on sqirl proxy, and proxy is MikroTik proxy!
He say that proxy is much faster then webproxy.
I have about 100-150 users in the moment. And I don’t have problems with that.
But thy to use proxy (install webproxy-test package)
Look for config here:
http://forum.mikrotik.com/t/transparent-web-proxy/14994/1
Regards,
Mladen