[zorp] zorp vs. TIS

hi, everybody: Recently, I use TIS(http://www.tis.com/research/software/) as http,ftp,telnet proxy. I integrated TIS with ipchains, squid,FreeS/WAN packages in Red Hat Linux. But it seem to become the system performance bottleneck. May I ask that zorp is a good replacement for TIS in performance and capability ? Thanks.