Go to menu and then select the source tab. There is an option for Browse Information there. Either untick that to disable all browse information, or change the radiobox to Functions Only (which builds a lot faster). Those options are what the building projdefs.tag stuff is.
I find that having Functions Only is nice and fast but having the full browse information makes the additional step quite slow, much the same problem you are having I guess.
Also adding #define WIN32_LEAN_AND_MEAN before you include windows.h increases compile speed.
shelded