Performance Problem: Delay on first request
The first page of my site takes up to 15 secs to load and then the site become responsive. If I leave the site for 20 min or so, the first request is very long again.
Following recommendations found on this similar question, I checked the Devel query logs and there is a whole bunch of queries related to
field_sql_storage_field_storage_load taking more than 250ms.
I am not sure it is purely related to
field_sql_storage_field_storage_load though as there is another
language_list query with a simple
SELECT * FROM languages ORDER BY weight ASC, name ASC taking 186ms.
My questions are: why do I encounter such delays and how can I reduce them?