"Tcl's most important role on the Web is in server-side generation of dynamic content. This is roughly the job Perl and Active Server Pages (ASP) tend to dominate."
"How does a development team choose one language for CGI over another? Most choice factors are non-technical. For example, many organizations may simply have policies that mandate Java, while sometimes a local college provides a ready source of training in a particular language. There was a time when Perl was considerably faster than Tcl for certain operations, but this is no longer the case."