Server - running php on iis7 under win2008 is too slow

Question

1. Due to business needs, a php website is run on a win2008 server that is already running a .net website. You need to use the second-level domain name to access the php program, so create a new site in iis7 and use FastCGI to run php.
2.php can be accessed, but every time the page is opened, there will be no response for a few seconds.
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3. Then look at the server log and find that there are many errors in php

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4. Since I am not very familiar with the iis server, would you like to ask an expert how to solve the long access waiting time and php errors.