PHP4.x, IIS4, NT4-SP6 long delay

Hi all I have problem with running PHP4 and IIS4. Php script causes long delay before loading page. It's working correctly and fast on Apache server but not on IIS. When I executing page first time, page is loaded fast. But when I click on refresh button, the answer is long delay ;( about 10-15 sec. and after that the page is reloaded. I dont't know why..... php script may be shortly like a <? $a = 1; ?> but problem still occurs.... Please help me....this project must run on IIS... What is wrong ? I used following sequences to instal php on NT4&IIS ---------- To install PHP on an NT Server running IIS 4, follow these instructions: . In Internet Service Manager (MMC), select the Web site or the starting point directory of anapplication. . Open the directory's property sheets (by right clicking and selecting properties), and then click the Home Directory, Virtual Directory, or Directory tab. . Click the Configuration button, and then click the App Mappings tab. . Click Add, and in the Executable box, type: c:\path-to-php-dir\php.exe %s %s. You MUST have the %s %s on the end, PHP will not function properly if you fail to do this. . In the Extension box, type the file name extension you want associated with PHP scripts. (You must repeat step 5 and 6 for each extension you want accociated with PHP scripts. (.php3 and.phtml are common.) . Set up the appropriate security. (This is done in Internet Service Manager), and if your NT Server uses NTFS file system, add execute rights for I_USR_ to the directory that contains php.exe.