SharePoint - Warm-up with PowerShell vs. App Initialization

I have a SharePoint 2013 farm with two app servers and three WFE's. These are running on W2012 Server. I have implemented App Initialization thinking that this would replace what I have always done, used a PowerShell script to warm up the site. I do not see any improvement in performance really however, so either I have App Initialization implemented incorrectly or it does not warm up the farm as I thought it would. Any advice or ideas would be appreciated.

Thanks
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Walter CurtisSharePoint AEDAsked:
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Rainer JeschorConnect With a Mentor Commented:
Hi,
how did you configure this?
A good step-by-step can be found here:
http://thesharepointfarm.com/2012/06/sharepoint-warm-up-scripts-a-thing-of-the-past/

HTH
Rainer
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Justin SmithSr. System EngineerCommented:
In my experience the App Init. process only works on anonymous sites.  

This is the latest one I've been using for non-anon sites.
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Walter CurtisSharePoint AEDAuthor Commented:
Thanks for the good information. I am going to review and run with them. Here is what I based my configuration on:

http://www.iis.net/learn/get-started/whats-new-in-iis-8/iis-80-application-initialization


I will update results as soon as I can.

Danke
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Walter CurtisSharePoint AEDAuthor Commented:
Update - following your link Rainer, I reconfigured my farm and performance is greatly improved, very good in fact. Achilles, thanks for the information, but I am able to avoid a warm up script now.
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Walter CurtisSharePoint AEDAuthor Commented:
I had configured the Start Mode via the applicationhost.config file for all servers in the farm and all web apps. I must have done it wrong because using IIS Manager (GUI), all web apps showed as on-demand still. Thanks for the article from Rainer the got me to check in the GUI and then correctly set the setting. Performance is as it should be now. vielen dank
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