We use Google Analytics to measure traffic on one of our websites (who doesn't?).
One of the thing that strikes us is the "page speed" tab. It shows that our website takes on average 5.69 seconds to load over the last 30 days. This is clearly way too slow, and we want to make that much faster.
We are a PHP and Apache site, but we use Google's Site Optimizer module for Apache.
The content itself. With
ab, I find that it takes on average 150ms to serve each and every document, also, a single document is loaded with 5 calls (1 CSS, 1 JS and 2 images). However, these assets should obviously be cached after the first request.
When I look at the "Network" tab in Google Chrome, I find that my site is slow mostly due to adsense, analytics, Google+, doubleclick... or even Facebook (we show a widget). These should obviously not be counted in the "load time" for our page, because these are not part of the content.
The site is Jobetudiant and you can access a version of it with no extra JS calls by adding
noext&nopub to any URL.
What would you do to optimize the load and rendering times?