Very slow first time load of pre - compiled, not updateable project

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IIS7

ASP.NET

IIS

I have 2 servers: windows server 2012r2 and windows server 2008r2, both running the same website (project application).
My project is pre-compiled and not updateable.

When deploying the published project on the 2012 server - it takes about 3-5 seconds to load the first page first time , which is OK.

But on the 2008 server it takes almot 2 minutes to load the first page for the first time!

Both servers has the same settings for application pool.

The slow load happens after updating files (publishing the web site) or restarting IIS.

Does any one have an idea why starting the application is so slow on the 2008 server?