Horizontal menu brakes on flush cache

Hey guys,

I'm newbie to drupal and recently I experienced very strange issue. I have a website with multilingual options but when I flush cache my menu brakes and displays all the language available. What I've noticed is that on flush cache the setting for the horizontal menu are changed. You can see my site here and how the menu behaves. Please advice as I'm out of options already.

Warning: Invalid argument supplied for foreach() in form_type_checkboxes_value()

Hello, I keep getting the following warning:
Warning: Invalid argument supplied for foreach() in form_type_checkboxes_value() (line 2390 of /.../includes/form.inc).
This seems to have been reported a number of times before. The respective code is

POST Calls in wait state


We are running load test for POST calls and we observed that for 100 concurrent users time goes up to 16 seconds per request. After some findings we come to know that no load on database but many requests at Drupal server are in wait state and sends request after 5-10 seconds hence we get delayed response back on website.

We are not able to identify that this wait is for what? (database connection/ Drupal level processing is going on / something else)

Any pointers/ suggestions are helpful in finding out the solution for this.


Post API Performance issue

We are working on Drupal site where we are expecting approximately 2000 concurrent users. Among these users more than 50% users will post comments on various topics which are displayed on the site. We are facing issue in terms of performance test for all POST calls. We are running test for 100 concurrent users where POST calls are going way high approximately 16 seconds per request.

We are using 2 drupal servers and Percona cluster at back. When we did some investigation and we observed that DB server CPU is in good shape where as Drupal CPUs are going high.

Another issue updating to 7.50

I recently updated from Drupal 7.44 to 7.50 (by deleting everything except the sites folder from the server, then uploading everything from the downloaded Drupal 7.50 directory, apart from the sites folder).
On running http://mysite/update.php I get sixteen errors each telling me that a module does not exist.

Does Large # of Revisions Affect Pageload Time?

If a Drupal site have a lot of content pages that have a huge number of revisions for each page, does that affect the overall performance and pageload of the entire website?


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