Concrete 5.6 on IIS lighning fast, 5.7 slooooooow

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Hello,
I have several concrete 5.6 on a Windows 2012 server (IIS 8), PHP 5.6, no problem, works flawlessy, they work very fast.
I'm testing Concrete 5.7.5.6 (latest at time of writing), all is working except speed (this post) and extensions download/update (other post).

The super slow phase is first page loading (something like 20-30 seconds waiting...), then it seems slow but not so deeply.
I managed to speed up enabling full page caching but first page after some time that no one is browsing the site is slow again.

Do anyone have some advices to improve that?

Thank you to all who wants to help me.
Best regards,
Henrik Sozzi

energywave
 
A3020 replied on at Permalink Reply
A3020
Do you see any non-200 response codes in your Chrome network tab?
energywave replied on at Permalink Reply
energywave
I was configuring multilanguage so the first reply is a 302 to en-us. That 302 reply is taking 19.48 sec and the second reply from en-us page is taking another 10.32 sec, so that before 30sec nothing happens. Terrible!!!
All subsequent requests are completing in less than a second except favicon.ico with a 404 reply (I did non configured it already) and home?_ccm_dashboard_external=1 that are taking 13 sec each.

Please help me to understand where to investigate...
A3020 replied on at Permalink Reply
A3020
Have you disabled all add-ons? Go to Packages table, set all pkgIsInstalled to 0.
Is there anything in your IIS or SQL log? If you monitor system resources, do you see peaks in CPU, memory or disk IO during the request?