We did a little digging and came upon the Microsoft knowledge base article below.
The customer reran his tests using the suggested resolution and confirmed that with the suggested registry setting our IIS6 performance is slightly better than our IIS5 performance, as it should be.
We'll publish this as a TechNote shortly, but if you're on IIS6, check it out.
Damon
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IIS6 BUG: You notice that IIS 6.0 is slower than IIS 5.0 when you use the WriteClient API to send data
http://support.microsoft.com/default.aspx?scid=kb;EN-US;840875
The ISAPI connector is using the synchronous WriteClient() API. Windows 2003 SP1 is expected to contain a fix for this issue.
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