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Dashboard loads really slowly, public site is quick

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Hi all

I'm working on a client's site which is on a dedicated server and I'm finding that the first load of the Dashboard after login is very slow (10 seconds), but after that it's pretty quick. Other Dashboard pages are intermittently slow and reasonably quick to load.

The server's a tiny wee thing (Atom 1.6, 512meg ram), but it's the only site on it and there are no other running services so it should be pretty snappy (avg load is below 0.1).

Here's the environment:

# concrete5 Version
5.4.1.1
# concrete5 Packages
All In: The Advanced User Import Add-on (1.1), Expander (1.0), Font Scaler (1.0.0), Iframe (1.0), kino's Import Users (1.0), Mailing List (2.11), Mail Monkey (1.1.5), Next & Previous (1.01), Page List Teasers (1.01), Pending Pages (0.5), Sitemap Extention (0.3), SQL Buddy (1.0), Stickies (1.2.3), tnSpacer (1.2), Traffic & Statistics (2.38), Trans Marine Save Area To Pdf (0.9.3), User Info (1.8).
# concrete5 Overrides
blocks/guestbook, blocks/page_list, blocks/content, blocks/google_map, blocks/external_form, blocks/person, blocks/search, blocks/contact_form, blocks/autonav, elements/header_required.php1, elements/profile, css/ccm.profile.css, css/ccm.forms.css1, mail/forgot_password.php, mail/block_form_submission.php.bak, models/user.php, models/attribute, single_pages/page_not_found.php, single_pages/members.php, single_pages/profile, single_pages/dashboard, single_pages/login.php, themes/scotlawcom, tools/page_controls_menu_js.php
# Server Software
Apache
# Server API
apache2handler
# PHP Version
5.2.6-3ubuntu4.5
# PHP Extensions
apache2handler, apc, bcmath, bz2, calendar, ctype, curl, date, dba, dom, exif, filter, ftp, gd, gettext, hash, iconv, json, libxml, mbstring, mcrypt, mime_magic, mysql, mysqli, openssl, pcre, PDO, pdo_mysql, posix, Reflection, session, shmop, SimpleXML, soap, sockets, SPL, standard, suhosin, sysvmsg, sysvsem, sysvshm, tokenizer, wddx, xml, xmlreader, xmlwriter, zip, zlib.
# PHP Settings
Viewing 15 lines of 69 lines. View entire code block.


Basic cache is enabled.

I have the Zend Cache line in site.php:

define('CACHE_FRONTEND_OPTIONS', serialize(array('automatic_cleaning_factor' => 0)));


Does anyone have any suggestions?
melat0nin