Trac 0.8 and later (not yet released) supports ​mod_python, which speeds up Trac's response times considerably and permits use of many Apache features not possible with tracd/mod_proxy.

Here's a typical Trac CGI/Apache setup:

ScriptAlias /trac/myproject /path/to/python/share/trac/cgi-bin/trac.cgi
<Location /trac/myproject>
   SetEnv TRAC_ENV /var/svn/trac/myproject
</Location>

The equivalent mod_python setup is:

<Location /trac/myproject>
   SetHandler mod_python
   PythonHandler trac.ModPythonHandler
   PythonOption TracEnv /var/svn/trac/myproject
</Location>