I am using the Drupal 7 and multiple modules. it is hosted on Cloud service provided by Hostgator.
the website is very slow and it take on average 2-3 second on home page to open for the first time. the load time may go upto 10 sec+ sometime. other link within the administration page are slow to open/response like opening the module page, structure page etc.
As per Hostgator, it is database which is slow and hence queries are taking long time. sometimes it take so long that have to kill the user/script which is running the database.
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I checked my logs and I'm seeing a bunch of "PHP Fatal error: Allowed memory size of 404750336 bytes exhausted".
I haven't noticed any problems myself but I increased the limit to 400M now and am still seeing this in the error logs (a couple per hour).
Any ideas how to identify what could be causing this?
This seems to happen in different locations in the code, so no idea where to start:
In Drupal default pager is act as refresh the page to list paged contents with pagination. We can change pager to Ajax pager with simple below javascript. The Ajax pager helps to load next page content instead of loading full page.