use Perl

Template::Timer provides inline timings of the template processing througout your code. It's an overridden version of Template::Context that wraps the process() and include() methods.

Using Template::Timer is simple.

my %config = ( # Whatever your config is
    INCLUDE_PATH    => "/my/template/path",
    COMPILE_EXT     => ".ttc",
    COMPILE_DIR     => "/tmp/tt",
);

if ( $development_mode ) {
    $config{ CONTEXT } = Template::Timer->new( %config );
}

my $template = Template->new( \%config );

Now when you process templates, HTML comments will get embedded in your output, which you can easily grep for.

<!-- TIMER START: process mainmenu/mainmenu.ttml -->
<!-- TIMER START: include mainmenu/cssindex.tt -->
<!-- TIMER START: process mainmenu/cssindex.tt -->
<!-- TIMER END: process mainmenu/cssindex.tt (0.017279 seconds) -->
<!-- TIMER END: include mainmenu/cssindex.tt (0.017401 seconds) -->

....

<!-- TIMER END: process mainmenu/footer.tt (0.003016 seconds) -->
<!-- TIMER END: include mainmenu/footer.tt (0.003104 seconds) -->
<!-- TIMER END: process mainmenu/mainmenu.ttml (0.400409 seconds) -->

Note that since INCLUDE is a wrapper around PROCESS, calls to INCLUDEs will be doubled up, and slightly longer than the PROCESS call.