Every time you update your Kentico site does it slow down and take forever to load? When you look in your Event Log is it showing numerous StartApp and EndApp events? If so, and you are running windows server 2012 R2, you may need a hotfix!
As detailed by Miro Remias in his article, "Resolving the IIS configuration change issue", Kentico uses the App_Data folder to store many files including smart search indexes. Every time you make a change to your site and the content is re-indexed, IIS detects a configuration change and causes the application to restart. This isn't supposed to happen.
Fortunately, Microsoft has a hotfix for the issue.
If you need any help with your site, or have any questions, feel free to get in touch with us!