Normally I'm not working that much with craft and twig syntax, so first of all sorry if I'm not that much into that topic (normaly html,css,js,jquery). There is one site which need so much time to load. There is much data to load but that can't be the reason that the server needs about 25s to respond. Do you have any performance tips?
Live Example: http://www.christlicher-gesundheitskongress.de/program.html
Probably this snippet is responsible for the long load time.
{% set z = 0 %}
{% for program_block in craft.categories.group('program_block') %}
<div class="program-block" data-index="{{z}}" id="{{z}}">
<div class="block-header">
<h3>{{ program_block.title }}</h3>
<h5><span>{{ program_block.program_date | date ('l, d. F') }} von </span>{{ program_block.time_start | date('H:i') }} - {{ program_block.time_end | date('H:i') }}</h5>
</div>
<div class="block-body double">
{# {% cache %} #}
{% for program in craft.entries.section('program_point').order('program_number') %}
{% if program.block.first().title == program_block.title %}
<div class="seminar-box">
{% if program.type == "seminar" %}<a href="{{ program.url }}">{% endif %}
<h4><span> {# {% if program.type != "seminar" %}#{% endif %} #} {{ program.program_number }}</span>{{ program.title }}</h4>
{% if program.short_description|length %}
<p>{{ program.short_description }}</p>
{% endif %}
{% if program.type == "seminar" %}</a>{% endif %}
{% if program.program_referents|length %}
<span>
{% set i = 1 %}
{% for referent in program.program_referents %}
<!-- <a href="{{ referent.url }}" class="referent-link">--> {{ referent.referent_name }}<!--</a>--> {% if i != program.program_referents|length %}// {% endif %}
{% set i = i+1 %}
{% endfor %}
</span>
{% endif %}
</div>
{% endif %}
{% endfor %}
{# {% endcache %} #}
<div class="seminar-box fill_up"></div>
<div class="seminar-box fill_up"></div>
<div class="seminar-box fill_up"></div>
<div class="seminar-box fill_up"></div>
<div class="seminar-box fill_up"></div>
<div class="seminar-box fill_up"></div>
<div class="seminar-box fill_up"></div>
</div>
</div>
{% set z = z+1 %}
{% endfor %}