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I was wondering about how much traffic Drupal 7 can support. I have tried to find figures on the number of users that can be supported, but I could not find precise figures.

Using load balancing and a complex architecture, can drupal 7 cope with millions of users using Varnish, etc.?

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closed as primarily opinion-based by kiamlaluno Nov 1 '14 at 18:39

Many good questions generate some degree of opinion based on expert experience, but answers to this question will tend to be almost entirely based on opinions, rather than facts, references, or specific expertise.If this question can be reworded to fit the rules in the help center, please edit the question.

Check these out for an idea link 1 link 2 – Chapabu Apr 11 '12 at 20:34
up vote 14 down vote accepted

Have you seen the Drupal Showcase? Drupal.org also has thousands of users. There are many big sites who are running off of Drupal, Sony Music websites, the Grammy's, The White House, etc.

If you are asking what a good setup would be, the most common is to have a reverse proxy/load balancer and/or a static file server/cache such as Varnish or Nginx.

I would also suggest checking out the High Performance Group.

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thank you that was helpful – Alexander Apr 11 '12 at 20:52
Drupal.org is still using Drupal 6, and it is actually running on PressFlow. – kiamlaluno Apr 14 '12 at 18:17

Running Drupal by itself does not pose any particular limitations on number of visitors. Have no dynamic content, put a caching layer such as Varnish between your user and the httpd, use a CDN etc, and you can scale to any number of users.

Generate all content dynamically, cache nothing, no queries or HTML renders, set $_SESSION data for every user, implement a hundred hook_form_alters, and you can soon bring any server to it's knees on 10 users.

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As far as examples go, there's also the Blue Drop Awards. Check out the websites in the enterprise category.

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