Question about IIS logging and time degradation

Question

For years I always use IIS Looging always active on my sites. I currently use Windows Server 2008 R2 and Windows Server 2012. The official information I follow is this:

https://learn.microsoft.com/en-us/windows/desktop/http/iis-logging

I have looked for official information from Microsoft asking if it is recommended to always use this feature active or it is better to enable it only when you want to trace a problem.

• Do you know if there is any official information?
• Is there any study that says how much is the degradation of the response times or general speed of the site to be active?
• If I use an architecture with a Load Balancer F5 or A10 or Apache that connect to my nodes, is it recommended to use Logging in the Load Balancer always if it is deactivated in the nodes?

thanks!

Answer 1

IIS logging is processed on separate threads from the gateway services and app pools. Which means that it will not degrade performance.

Don't just take my word for it. If you want to confirm this, you can use a capacity testing tool (not recommended on your prod server, of course). Test your capacity with logging turned-on and logging turned-off. You will see that they are comparable.