The latest website I'm developing is slow loading. It is a Joomla 2.5 website. I have built numerous Joomla sites over the years and this is the first time I've had this problem.
I check the site speed with GTMetrix. It produces a Timeline graph that shows all the processes that happen when the page is loading. (Please see attachment) The second step takes almost 11 seconds of the total 13.62 seconds of the page load. That second step is the one where the most time gets consumed.
What is happening in that second step? This seems to be where the problem is - but I don't know what it's about...
When you expand that item, it shows the following information - but I don't know what this means:
Fri, 15 Feb 2013 17:33:40 GMT
Nginx / Varnish
CP="NOI ADM DEV PSAi COM NAV OUR OTRo STP IND DEM"
Mozilla/5.0 (X11; Linux i686 on x86_64; rv:14.0) Gecko/20100101 Firefox/14.0.1