All PHP pages (even blank) ultra slow on IIS 6

Black_Knight

Hi,
I'm running PHP 5.2.6 on IIS 6.
All PHP pages, even ones with no content are taking several seconds (5-6) to load. This does not affect static (HTML) pages which load instantly.
There are no reported errors shown, and error reporting is turned on.
It is not output buffering, which is a common issue with PHP on IIS.
Can anyone suggest any diagnostic steps I could take?

Could it be a particular extension which is failing to load, but not displaying an error?

I have put

error_reporting(E_ALL);
ini_set('display_startup_errors', 'On');
print_r(error_get_last());

at the start of my test script, but nothing is reported!
Could it be some weird permissions checking?

Any help appreciated.
Thanks.

Black_Knight

One thing I noticed when comparing the headers sent from IIS and my local Apache server was that Apache was sending a content-length header while IIS was not.

When I manually added a content-length header to my test script by doing

header('Content-Length:5041');

the page loads immediately.
Obviously this is not a solution.
I guess I need to be asking about this on an IIS forum...

bradgrafelman

How did you integrate PHP with IIS? I'm using IIS and FastCGI at one site and it successfully sets the Content-Length header for PHP scripts.

EDIT: Also note that enabling 'display_startup_error' inside a script is useless since by that time PHP has already "started up" and began executing code.

Black_Knight

It's a shared server.

I'm going to get them to turn output_buffering on in the php.ini file in case ob_start and ob_end_flush isn't doing the same thing, which it should be.

Point taken about display_startup_errors, but I think I can rule out any startup errors now.