I'm running MediaWiki 1.23 on the following machine:
- Windows Server 2008 R2
- IIS 7.5
- PHP 5.4.34
- Separate database server with MySQL 5.6.26
I was previously running this setup on a supposedly-identical machine, but since the transition I've seen the response times of wiki pages increase over time. Rebooting the application server brings the response times back into family. Please see the chart below showing the old server in blue (stable response times), and the new server in orange with steadily increasing response times which are reset by rebooting.
Also see the gray line which shows number of hits per day, which is relatively stable (though decreasing slightly probably due to my users not enjoying the slowness).
What could be causing this?
EDIT: The chart above has been updated with the latest data and some annotations.