Has anyone here upgraded from Windows Server 2003 to 2008? For the applications you run on it, did you have any major performance loss?
In my case, I just did a simple experiment with an old P4 box. Win 2003 runs like a normal desktop OS would. It's pretty speedy at starting up and running a lot of our applications. When I changed the OS to Windows Server 2008, a tremendous difference occurs, the desktop slows down to a crawl.
The CPU usage spikes to 100% and the OS can barely function, let alone operate in that P4 box. Using it as a server, I experienced a tiny delay but I was the only client. I have no idea what would happen if I had thousands/millions of connections.