>How did you determine that this is the case? What degradation did you find when using just one instance ?

If the worker process is allocated to process a hit, if no more is available, this will create a queue. We have a rate of 12 hits a second during the day. Despite the fact that most hits are answered in 0.1 to 0.3 second, some of them are sometimes taking a few seconds. The 2nd, 3rd and 4th worker process are really useful in that case. Sometimes, when all the four are allocated to answer a hit, all incoming hits qo in a queue until one is available. But, that is very rare and would last only for some fraction of a second.

>Pretty sure that you can. If IIS8 Express works (http://www.microsoft.com/en-gb/download/details.aspx?id=34679) then I'd assume same for full IIS8?

IIS 7 is built in the OS. I thought that IIS 8 was only available to Windows Server 2012, which I believe it is the new IIS version to be part of that OS. I did not know we were able to install a full version of IIS 8 to be downloaded and installed on Windows Server 2008. I do not know however if all the full capabilities would be able to be seen on that OS.

>MS might duck the issue if non-MS technologies are involved :-{

We'll have to wait and see. :)