Slow page render time

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Hi there

I'm using full page caching so when you visit this site as a normal visitor it is pretty fast at 2 seconds or so to load full page. However, as soon as you login, the full page cache doesn't seem to work for logged in users and as such it can take 13 seconds for a logged in user to load the homepage - at least 5 seconds minimum.

http://www.campdenbaptist.org.uk/...

I think the problem lies somewhere in perhaps too many addons or overrides or something, but again the blocks are cached and overrides cached so I don't understand why it's so slow, maybe they're not cached for registered users?

This is my env info:

# concrete5 Version
5.6.1.2
# concrete5 Packages
AddThis (1.0), Automatic Email Obfuscator (1.2.3), Aviary Image Editor (1.2), Breadcrumbs (2.0), Color Picker Attribute (1.0), Designer Content (3.1.1), Document Library (1.6.3), eCommerce (2.8.7), Facebook Like Button (1.1), Formigo Directions (1.0.2), Formigo Slider Harvga (1.0.4), Gallery (1.8), Homegroups (1.2.0), List files from set (1.0.4), Mailing List (2.44), Meetings (1.2.0), MindNet Clear Cache (1.0), Page Properties (1.0.1), Pro Events (9.2.2), ProEvents Booking (3.9.4), Sermons (1.0.0), Sitemap Extention (0.3), Vimeo Player (1.0.6), Youtube Extended (1.0.0).
# concrete5 Overrides
blocks/search, blocks/sitewide_alert_notice, blocks/pro_event_list, blocks/list_files_from_set, blocks/page_list, blocks/page_banner_large, blocks/autonav, blocks/page_banner_small, blocks/swp_breadcrumbs, blocks/content, blocks/form, blocks/tags, blocks/top_info_four_block, controllers/dashboard, controllers/profile, controllers/members.php, elements/profile, elements/permission, elements/header_required.php, helpers/text.php, helpers/concrete, helpers/form, js/gcal.js, js/jquery.colorpicker.js, css/fullcalendar.css, css/ccm.tweaks.css, css/ccm.profile.css, libraries/loader.php, models/page_list.php, models/user_list.php, models/collection_version.php, models/page_statistics.php, models/core_commerce, models/attribute, models/permission, models/file.php, single_pages/dashboard, single_pages/register.php, single_pages/profile, single_pages/members.php, single_pages/login.php, themes/CCBCmobile, themes/dashboard, themes/CCBC, tools/facebook.php, tools/files, tools/ajax_jq_cal.php, tools/edit_block_popup.php, tools/permissions, tools/reload_area_permissions_js.php, tools/facebook_retrieve.php, tools/add_event.php, tools/ajax_pe_cp.php, tools/edit_area_popup.php, tools/username_check.php, tools/base_facebook.php, tools/page_controls_menu_js.php
# Server Software
Apache/2.2.24 (Unix) mod_ssl/2.2.24 OpenSSL/1.0.0-fips DAV/2 mod_auth_passthrough/2.1 mod_bwlimited/1.4 FrontPage/5.0.2.2635 mod_perl/2.0.6 Perl/v5.8.8
# Server API
cgi-fcgi
# PHP Version
5.3.26
# PHP Extensions
bcmath, bz2, calendar, cgi-fcgi, Core, ctype, curl, date, dom, enchant, ereg, exif, filter, ftp, gd, gettext, hash, iconv, imap, ionCube Loader, json, libxml, mbstring, mcrypt, mysql, mysqli, openssl, pcre, PDO, pdo_mysql, pdo_sqlite, Phar, posix, pspell, Reflection, session, SimpleXML, soap, sockets, SourceGuardian, SPL, SQLite, sqlite3, standard, suhosin, tidy, tokenizer, wddx, xml, xmlreader, xmlrpc, xmlwriter, xsl, Zend Guard Loader, zip, zlib.
# PHP Settings


It's on cloud hosting (VPS) and seems in some way to be slower than an old shared host! (HostGator, now on UK2).
Can some bright soul enlighten me please?!

Thanks
Harvey

harveyappleton