You can also disable debug mode via the Web Access UI:
Under Virtual Machine Configuration, select Advanced tab and select Record runtime information. You will need to do this operation on a per VM basis.
I agree there is this "CheckBox" .. the problem is this at Beta Stage this CheckBox is "unpluged" meaning you can check or not in Beta this is regardless .. Search the community for "debug beta server" you might find various post concerning the fact that you can't disable debug in beta state ..
one bypass solution is mentioned above there are others ..
for windows host solution look Pin This Post: Resolve performance problems on Linux and Windows 2003 Servers (okay on windows not on linux)
That was beta 1. The checkbox is fully operational in beta 2.