Drupal 7 Really Slow on admin pages I have a Drupal 7 installation and several admin pages are incredibly slow and time out after 30 seconds.  I've tried several things without success:


APC is enabled
innodb_buffer_pool_size is set to 100 M
No unused modules are enabled.  I still have 155 modules enabled, for localization, commerce, captcha, questions &amp; answers, etc.
Standard cache is enabled and JS/CSS compression enabled. Memcached not being used.
Drupal 7, latest version


Even with that, the site is still really slow and there are pages that won't open (time out).  For example, installing a module will always fail the first time.  Accessing the settings of the Language Selection Page module will always fail, and so on.  Any recommendations other than increasing the timeout? 

I'm using WAMP.

UPDATE: The time out error shows it takes a while in this function mainly: drupal_flush_all_caches( )   ..\system.admin.inc:1766

Sometimes in other functions too.
If you can profile your site that's always helpful. https://drupal.stackexchange.com/questions/724/why-is-drupal-7-so-slow

https://groups.drupal.org/node/210683 - Older post but some patches have still not been committed.
https://groups.drupal.org/node/415883 - Speedups for the DB layer (caches mainly).

Because of windows checkout this post and this group
https://groups.drupal.org/node/242443
https://groups.drupal.org/drupal-windows