<% # XXX PROFILING %>
<% begin = Date.now() %>

<!-- ... -->

    <% for category in categories: %>

        <!-- ... -->

        <% # XXX PROFILING %>
        <% beginCategory = Date.now() %>

        <% for thing in things: %>
            <%- @partial 'partials/thing', {thing} %>
        <% end %>

        <% # XXX PROFILING %>
        <% time = Date.now() - beginCategory %>
        <% console.log "#{things.length} thing partials rendered in #{time} ms\n" %>

        <!-- ... -->

    <% end %>

<!-- ... -->