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Measure CSS rendering time

The Net in Firebug can do this.

Enable it, reload the page, and click on the CSS subtab.

There are two values you can look as the render completion times, the thin red and thin blue lines, compared to the end of the loading of actual files. DOMContentLoaded is the vertical blue line and load is represented by the vertical red line.

You can see the exact values by hovering over any request. (See screenshot.)

Scaling and Performance consulting

Stefan's recommended approach:

For performance consulting, begin by asking whether they have high server load or just slow page loads. In the latter case we must first find out if it's the server or something else yslow can tell you.

In the case of high server load you should ask for the slow log. It would be nice if they had monitoring data for cpu ram and so on. Don't ask for full access to the data first. Some companies are really cautious about that and it's not necessary to get access for a starter.

CSS and JavaScript aggregation in Drupal 7

stefan:h ave you noticed that javascript and css aggregation does not work as expected on
17:28 mlncn: how do you expect it to work? they changed it in D7, mostly for the better
17:28 stefan-agaric: there's 3 css and 2 js that seems to be created by it.
17:28 mlncn: there's more files, but they aren't recreated as often
17:28 stefan-agaric: what's the point?
17:29 mlncn: or rather, i should say, there's more files per page but fewer files when browsing around the site
17:29 stefan-agaric: we only need one.

Cache expiration in Drupal 7

On admin/config/development/performance

Minimum cache lifetime
Cached pages will not be re-created until at least this much time has elapsed.
Expiration of cached pages
The maximum time an external cache can use an old version of a page.

What exactly does each mean?

This is quite a major point of confusion for Drupal 6:

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