CacheISAPI Metabase Property (IIS 6.0)
The CacheISAPI property indicates whether ISAPI extensions are cached in memory after first use. If the value of this property is set to true, ISAPI extensions, once loaded, remain in the cache until the server is stopped. If the value is set to false, extensions are unloaded from memory after the ISAPI extension is no longer in use.
ISAPI extensions are cached or not cached based on the value of this property at the time they were loaded into memory for use. Thus, if this property is changed after an extension has been loaded and cached, the change will have no effect on that extension until the Web server is restarted.
There are severe performance implications to setting the value of this property to false. Also, some extensions cannot work properly when this property is set to false.
You can configure this property at the following locations in the IIS metabase.
For general code examples, see Code Examples to Configure Metabase Properties.